version: 3.4.6

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>

.github/ISSUE_TEMPLATE.md

@@ -1,2 +1,2 @@
 
-Please read https://github.com/coreos/etcd/blob/master/Documentation/reporting_bugs.md.
+Please read https://github.com/etcd-io/etcd/blob/master/Documentation/reporting_bugs.md.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,2 +1,2 @@
 
-Please read https://github.com/coreos/etcd/blob/master/CONTRIBUTING.md#contribution-flow.
+Please read https://github.com/etcd-io/etcd/blob/master/CONTRIBUTING.md#contribution-flow.

.github/SECURITY.md

@@ -0,0 +1,2 @@
+
+Please read https://github.com/etcd-io/etcd/blob/master/security/README.md.

.gitignore

@@ -13,6 +13,8 @@
 *.test
 hack/tls-setup/certs
 .idea
+/contrib/raftexample/raftexample
+/contrib/raftexample/raftexample-*
 
 # TODO: use dep prune
 # https://github.com/golang/dep/issues/120#issuecomment-306518546

.travis.yml

@@ -1,13 +1,12 @@
 language: go
-go_import_path: github.com/coreos/etcd
+go_import_path: go.etcd.io/etcd
 
 sudo: required
 
 services: docker
 
 go:
-- 1.10.3
-- tip
+- 1.12.12
 
 notifications:
   on_success: never
@@ -23,50 +22,21 @@ env:
   - TARGET=linux-amd64-unit
   - TARGET=all-build
   - TARGET=linux-amd64-grpcproxy
-  - TARGET=linux-amd64-coverage
-  - TARGET=linux-amd64-fmt-unit-go-tip
   - TARGET=linux-386-unit
 
 matrix:
   fast_finish: true
   allow_failures:
-  - go: 1.10.3
+  - go: 1.12.12
     env: TARGET=linux-amd64-grpcproxy
-  - go: 1.10.3
-    env: TARGET=linux-amd64-coverage
-  - go: tip
-    env: TARGET=linux-amd64-fmt-unit-go-tip
-  - go: 1.10.3
-    env: TARGET=linux-386-unit
-  exclude:
-  - go: tip
-    env: TARGET=linux-amd64-fmt
-  - go: tip
-    env: TARGET=linux-amd64-integration-1-cpu
-  - go: tip
-    env: TARGET=linux-amd64-integration-2-cpu
-  - go: tip
-    env: TARGET=linux-amd64-integration-4-cpu
-  - go: tip
-    env: TARGET=linux-amd64-functional
-  - go: tip
-    env: TARGET=linux-amd64-unit
-  - go: tip
-    env: TARGET=all-build
-  - go: tip
-    env: TARGET=linux-amd64-grpcproxy
-  - go: tip
-    env: TARGET=linux-amd64-coverage
-  - go: 1.10.3
-    env: TARGET=linux-amd64-fmt-unit-go-tip
-  - go: tip
+  - go: 1.12.12
     env: TARGET=linux-386-unit
 
 before_install:
 - if [[ $TRAVIS_GO_VERSION == 1.* ]]; then docker pull gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION}; fi
 
 install:
-- go get -t -d ./...
+- go get -t -v -d ./...
 
 script:
  - echo "TRAVIS_GO_VERSION=${TRAVIS_GO_VERSION}"
@@ -74,37 +44,37 @@ script:
     case "${TARGET}" in
       linux-amd64-fmt)
         docker run --rm \
-          --volume=`pwd`:/go/src/github.com/coreos/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
+          --volume=`pwd`:/go/src/go.etcd.io/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
           /bin/bash -c "GOARCH=amd64 PASSES='fmt bom dep' ./test"
         ;;
       linux-amd64-integration-1-cpu)
         docker run --rm \
-          --volume=`pwd`:/go/src/github.com/coreos/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
+          --volume=`pwd`:/go/src/go.etcd.io/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
           /bin/bash -c "GOARCH=amd64 CPU=1 PASSES='integration' ./test"
         ;;
       linux-amd64-integration-2-cpu)
         docker run --rm \
-          --volume=`pwd`:/go/src/github.com/coreos/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
+          --volume=`pwd`:/go/src/go.etcd.io/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
           /bin/bash -c "GOARCH=amd64 CPU=2 PASSES='integration' ./test"
         ;;
       linux-amd64-integration-4-cpu)
         docker run --rm \
-          --volume=`pwd`:/go/src/github.com/coreos/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
+          --volume=`pwd`:/go/src/go.etcd.io/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
           /bin/bash -c "GOARCH=amd64 CPU=4 PASSES='integration' ./test"
         ;;
       linux-amd64-functional)
         docker run --rm \
-          --volume=`pwd`:/go/src/github.com/coreos/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
+          --volume=`pwd`:/go/src/go.etcd.io/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
           /bin/bash -c "./build && GOARCH=amd64 PASSES='functional' ./test"
         ;;
       linux-amd64-unit)
         docker run --rm \
-          --volume=`pwd`:/go/src/github.com/coreos/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
+          --volume=`pwd`:/go/src/go.etcd.io/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
           /bin/bash -c "GOARCH=amd64 PASSES='unit' ./test"
         ;;
       all-build)
         docker run --rm \
-          --volume=`pwd`:/go/src/github.com/coreos/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
+          --volume=`pwd`:/go/src/go.etcd.io/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
           /bin/bash -c "GOARCH=amd64 PASSES='build' ./test \
             && GOARCH=386 PASSES='build' ./test \
             && GO_BUILD_FLAGS='-v' GOOS=darwin GOARCH=amd64 ./build \
@@ -116,15 +86,9 @@ script:
       linux-amd64-grpcproxy)
         sudo HOST_TMP_DIR=/tmp TEST_OPTS="PASSES='build grpcproxy'" make docker-test
         ;;
-      linux-amd64-coverage)
-        sudo HOST_TMP_DIR=/tmp make docker-test-coverage
-        ;;
-      linux-amd64-fmt-unit-go-tip)
-        GOARCH=amd64 PASSES='fmt unit' ./test
-        ;;
       linux-386-unit)
         docker run --rm \
-          --volume=`pwd`:/go/src/github.com/coreos/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
+          --volume=`pwd`:/go/src/go.etcd.io/etcd gcr.io/etcd-development/etcd-test:go${TRAVIS_GO_VERSION} \
           /bin/bash -c "GOARCH=386 PASSES='unit' ./test"
         ;;
     esac

.words

@@ -8,7 +8,8 @@ MiB
 ResourceExhausted
 RPC
 RPCs
-
+parsedTarget
+SRV
 WithRequireLeader
 InfoLevel
 args
@@ -35,6 +36,8 @@ iff
 inflight
 keepalive
 keepalives
+hasleader
+racey
 keyspace
 linearization
 liveness
@@ -94,12 +97,16 @@ jitter
 WithBackoff
 BackoffLinearWithJitter
 jitter
+WithDialer
 WithMax
 ServerStreams
 BidiStreams
 transientFailure
 BackoffFunc
 CallOptions
-
+PermitWithoutStream
 __lostleader
 ErrConnClosing
+unfreed
+grpcAddr
+clientURLs

CHANGELOG-2.3.md

@@ -1,10 +0,0 @@
-
-
-## [v2.3.8](https://github.com/coreos/etcd/releases/tag/v2.3.8) (2017-02-17)
-
-See [code changes](https://github.com/coreos/etcd/compare/v2.3.7...v2.3.8).
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-

CHANGELOG-3.0.md

@@ -1,203 +0,0 @@
-
-
-## [v3.0.16](https://github.com/coreos/etcd/releases/tag/v3.0.16) (2016-11-13)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.15...v3.0.16) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Go
-
-- Compile with [*Go 1.6.4*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.15](https://github.com/coreos/etcd/releases/tag/v3.0.15) (2016-11-11)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.14...v3.0.15) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Fixed
-
-- Fix cancel watch request with wrong range end.
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.14](https://github.com/coreos/etcd/releases/tag/v3.0.14) (2016-11-04)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.13...v3.0.14) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Added
-
-- v3 `etcdctl migrate` command now supports `--no-ttl` flag to discard keys on transform.
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.13](https://github.com/coreos/etcd/releases/tag/v3.0.13) (2016-10-24)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.12...v3.0.13) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.12](https://github.com/coreos/etcd/releases/tag/v3.0.12) (2016-10-07)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.11...v3.0.12) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.11](https://github.com/coreos/etcd/releases/tag/v3.0.11) (2016-10-07)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.10...v3.0.11) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Added
-
-- Server returns previous key-value (optional)
-  - `clientv3.WithPrevKV` option
-  - v3 etcdctl `put,watch,del --prev-kv` flag
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.10](https://github.com/coreos/etcd/releases/tag/v3.0.10) (2016-09-23)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.9...v3.0.10) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.9](https://github.com/coreos/etcd/releases/tag/v3.0.9) (2016-09-15)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.8...v3.0.9) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Added
-
-- Warn on domain names on listen URLs (v3.2 will reject domain names).
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.8](https://github.com/coreos/etcd/releases/tag/v3.0.8) (2016-09-09)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.7...v3.0.8) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Other
-
-- Allow only IP addresses in listen URLs (domain names are rejected).
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.7](https://github.com/coreos/etcd/releases/tag/v3.0.7) (2016-08-31)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.6...v3.0.7) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Other
-
-- SRV records only allow A records (RFC 2052).
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.6](https://github.com/coreos/etcd/releases/tag/v3.0.6) (2016-08-19)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.5...v3.0.6) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.5](https://github.com/coreos/etcd/releases/tag/v3.0.5) (2016-08-19)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.4...v3.0.5) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Other
-
-- SRV records (e.g., infra1.example.com) must match the discovery domain (i.e., example.com) if no custom certificate authority is given.
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.4](https://github.com/coreos/etcd/releases/tag/v3.0.4) (2016-07-27)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.3...v3.0.4) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Added
-
-- v2 `etcdctl ls` command now supports `--output=json`.
-- Add /var/lib/etcd directory to etcd official Docker image.
-
-### Other
-
-- v2 auth can now use common name from TLS certificate when `--client-cert-auth` is enabled.
-
-### Go
-
-- Compile with [*Go 1.6.3*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.3](https://github.com/coreos/etcd/releases/tag/v3.0.3) (2016-07-15)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.2...v3.0.3) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Other
-
-- Revert Dockerfile to use `CMD`, instead of `ENTRYPOINT`, to support `etcdctl` run.
-  - Docker commands for v3.0.2 won't work without specifying executable binary paths.
-- v3 etcdctl default endpoints are now `127.0.0.1:2379`.
-
-### Go
-
-- Compile with [*Go 1.6.2*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.2](https://github.com/coreos/etcd/releases/tag/v3.0.2) (2016-07-08)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.1...v3.0.2) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Other
-
-- Dockerfile uses `ENTRYPOINT`, instead of `CMD`, to run etcd without binary path specified.
-
-### Go
-
-- Compile with [*Go 1.6.2*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.1](https://github.com/coreos/etcd/releases/tag/v3.0.1) (2016-07-01)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.0...v3.0.1) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Go
-
-- Compile with [*Go 1.6.2*](https://golang.org/doc/devel/release.html#go1.6).
-
-
-## [v3.0.0](https://github.com/coreos/etcd/releases/tag/v3.0.0) (2016-06-30)
-
-See [code changes](https://github.com/coreos/etcd/compare/v2.3.0...v3.0.0) and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_0.md).**
-
-### Go
-
-- Compile with [*Go 1.6.2*](https://golang.org/doc/devel/release.html#go1.6).
-

CHANGELOG-3.1.md

@@ -1,405 +0,0 @@
-
-
-Previous change logs can be found at [CHANGELOG-3.0](https://github.com/coreos/etcd/blob/master/CHANGELOG-3.0.md).
-
-
-## [v3.1.19](https://github.com/coreos/etcd/releases/tag/v3.1.19) (2018-07-24)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.18...v3.1.19) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### Improved
-
-- Improve [Raft Read Index timeout warning messages](https://github.com/coreos/etcd/pull/9897).
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-1) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd_server_go_version`](https://github.com/coreos/etcd/pull/9957) Prometheus metric.
-- Add [`etcd_server_slow_read_indexes_total`](https://github.com/coreos/etcd/pull/9897) Prometheus metric.
-- Add [`etcd_server_quota_backend_bytes`](https://github.com/coreos/etcd/pull/9820) Prometheus metric.
-  - Use it with `etcd_mvcc_db_total_size_in_bytes` and `etcd_mvcc_db_total_size_in_use_in_bytes`.
-  - `etcd_server_quota_backend_bytes 2.147483648e+09` means current quota size is 2 GB.
-  - `etcd_mvcc_db_total_size_in_bytes 20480` means current physically allocated DB size is 20 KB.
-  - `etcd_mvcc_db_total_size_in_use_in_bytes 16384` means future DB size if defragment operation is complete.
-  - `etcd_mvcc_db_total_size_in_bytes - etcd_mvcc_db_total_size_in_use_in_bytes` is the number of bytes that can be saved on disk with defragment operation.
-- Add [`etcd_mvcc_db_total_size_in_bytes`](https://github.com/coreos/etcd/pull/9819) Prometheus metric.
-  - In addition to [`etcd_debugging_mvcc_db_total_size_in_bytes`](https://github.com/coreos/etcd/pull/9819).
-- Add [`etcd_mvcc_db_total_size_in_use_in_bytes`](https://github.com/coreos/etcd/pull/9256) Prometheus metric.
-  - Use it with `etcd_mvcc_db_total_size_in_bytes` and `etcd_mvcc_db_total_size_in_use_in_bytes`.
-  - `etcd_server_quota_backend_bytes 2.147483648e+09` means current quota size is 2 GB.
-  - `etcd_mvcc_db_total_size_in_bytes 20480` means current physically allocated DB size is 20 KB.
-  - `etcd_mvcc_db_total_size_in_use_in_bytes 16384` means future DB size if defragment operation is complete.
-  - `etcd_mvcc_db_total_size_in_bytes - etcd_mvcc_db_total_size_in_use_in_bytes` is the number of bytes that can be saved on disk with defragment operation.
-
-### client v3
-
-- Fix [lease keepalive interval updates when response queue is full](https://github.com/coreos/etcd/pull/9952).
-  - If `<-chan *clientv3LeaseKeepAliveResponse` from `clientv3.Lease.KeepAlive` was never consumed or channel is full, client was [sending keepalive request every 500ms](https://github.com/coreos/etcd/issues/9911) instead of expected rate of every "TTL / 3" duration.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.1.18](https://github.com/coreos/etcd/releases/tag/v3.1.18) (2018-06-15)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.17...v3.1.18) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-1) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd_server_version`](https://github.com/coreos/etcd/pull/8960) Prometheus metric.
-  - To replace [Kubernetes `etcd-version-monitor`](https://github.com/coreos/etcd/issues/8948).
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.1.17](https://github.com/coreos/etcd/releases/tag/v3.1.17) (2018-06-06)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.16...v3.1.17) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### etcd server
-
-- Fix [v3 snapshot recovery](https://github.com/coreos/etcd/issues/7628).
-  - A follower receives a leader snapshot to be persisted as a `[SNAPSHOT-INDEX].snap.db` file on disk.
-  - Now, server [ensures that the incoming snapshot be persisted on disk before loading it](https://github.com/coreos/etcd/pull/7876).
-  - Otherwise, index mismatch happens and triggers server-side panic (e.g. newer WAL entry with outdated snapshot index).
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.1.16](https://github.com/coreos/etcd/releases/tag/v3.1.16) (2018-05-31)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.15...v3.1.16) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### etcd server
-
-- Fix [`mvcc` server panic from restore operation](https://github.com/coreos/etcd/pull/9775).
-  - Let's assume that a watcher had been requested with a future revision X and sent to node A that became network-partitioned thereafter. Meanwhile, cluster makes progress. Then when the partition gets removed, the leader sends a snapshot to node A. Previously if the snapshot's latest revision is still lower than the watch revision X,  **etcd server panicked** during snapshot restore operation.
-  - Now, this server-side panic has been fixed.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.1.15](https://github.com/coreos/etcd/releases/tag/v3.1.15) (2018-05-09)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.14...v3.1.15) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### etcd server
-
-- Purge old [`*.snap.db` snapshot files](https://github.com/coreos/etcd/pull/7967).
-  - Previously, etcd did not respect `--max-snapshots` flag to purge old `*.snap.db` files.
-  - Now, etcd purges old `*.snap.db` files to keep maximum `--max-snapshots` number of files on disk.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.1.14](https://github.com/coreos/etcd/releases/tag/v3.1.14) (2018-04-24)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.13...v3.1.14) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-1) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd_server_is_leader`](https://github.com/coreos/etcd/pull/9587) Prometheus metric.
-
-### etcd server
-
-- Add [`--initial-election-tick-advance`](https://github.com/coreos/etcd/pull/9591) flag to configure initial election tick fast-forward.
-  - By default, `--initial-election-tick-advance=true`, then local member fast-forwards election ticks to speed up "initial" leader election trigger.
-  - This benefits the case of larger election ticks. For instance, cross datacenter deployment may require longer election timeout of 10-second. If true, local node does not need wait up to 10-second. Instead, forwards its election ticks to 8-second, and have only 2-second left before leader election.
-  - Major assumptions are that: cluster has no active leader thus advancing ticks enables faster leader election. Or cluster already has an established leader, and rejoining follower is likely to receive heartbeats from the leader after tick advance and before election timeout.
-  - However, when network from leader to rejoining follower is congested, and the follower does not receive leader heartbeat within left election ticks, disruptive election has to happen thus affecting cluster availabilities.
-  - Now, this can be disabled by setting `--initial-election-tick-advance=false`.
-  - Disabling this would slow down initial bootstrap process for cross datacenter deployments. Make tradeoffs by configuring `--initial-election-tick-advance` at the cost of slow initial bootstrap.
-  - If single-node, it advances ticks regardless.
-  - Address [disruptive rejoining follower node](https://github.com/coreos/etcd/issues/9333).
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.1.13](https://github.com/coreos/etcd/releases/tag/v3.1.13) (2018-03-29)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.12...v3.1.13) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### Improved
-
-- Adjust [election timeout on server restart](https://github.com/coreos/etcd/pull/9415) to reduce [disruptive rejoining servers](https://github.com/coreos/etcd/issues/9333).
-  - Previously, etcd fast-forwards election ticks on server start, with only one tick left for leader election. This is to speed up start phase, without having to wait until all election ticks elapse. Advancing election ticks is useful for cross datacenter deployments with larger election timeouts. However, it was affecting cluster availability if the last tick elapses before leader contacts the restarted node.
-  - Now, when etcd restarts, it adjusts election ticks with more than one tick left, thus more time for leader to prevent disruptive restart.
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-1) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add missing [`etcd_network_peer_sent_failures_total` count](https://github.com/coreos/etcd/pull/9437).
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.1.12](https://github.com/coreos/etcd/releases/tag/v3.1.12) (2018-03-08)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.11...v3.1.12) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### etcd server
-
-- Fix [`mvcc` "unsynced" watcher restore operation](https://github.com/coreos/etcd/pull/9297).
-  - "unsynced" watcher is watcher that needs to be in sync with events that have happened.
-  - That is, "unsynced" watcher is the slow watcher that was requested on old revision.
-  - "unsynced" watcher restore operation was not correctly populating its underlying watcher group.
-  - Which possibly causes [missing events from "unsynced" watchers](https://github.com/coreos/etcd/issues/9086).
-  - A node gets network partitioned with a watcher on a future revision, and falls behind receiving a leader snapshot after partition gets removed. When applying this snapshot, etcd watch storage moves current synced watchers to unsynced since sync watchers might have become stale during network partition. And reset synced watcher group to restart watcher routines. Previously, there was a bug when moving from synced watcher group to unsynced, thus client would miss events when the watcher was requested to the network-partitioned node.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.1.11](https://github.com/coreos/etcd/releases/tag/v3.1.11) (2017-11-28)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.10...v3.1.11) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### etcd server
-
-- [#8411](https://github.com/coreos/etcd/issues/8411),[#8806](https://github.com/coreos/etcd/pull/8806) backport "mvcc: sending events after restore"
-- [#8009](https://github.com/coreos/etcd/issues/8009),[#8902](https://github.com/coreos/etcd/pull/8902) backport coreos/bbolt v1.3.1-coreos.5
-
-### Go
-
-- Compile with [*Go 1.8.5*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.1.10](https://github.com/coreos/etcd/releases/tag/v3.1.10) (2017-07-14)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.9...v3.1.10) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### Added
-
-- Tag docker images with minor versions.
-  - e.g. `docker pull quay.io/coreos/etcd:v3.1` to fetch latest v3.1 versions.
-
-### Go
-
-- Compile with [*Go 1.8.3*](https://golang.org/doc/devel/release.html#go1.8).
-  - Fix panic on `net/http.CloseNotify`
-
-
-## [v3.1.9](https://github.com/coreos/etcd/releases/tag/v3.1.9) (2017-06-09)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.8...v3.1.9) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### etcd server
-
-- Allow v2 snapshot over 512MB.
-
-### Go
-
-- Compile with [*Go 1.7.6*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-## [v3.1.8](https://github.com/coreos/etcd/releases/tag/v3.1.8) (2017-05-19)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.7...v3.1.8) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-## [v3.1.7](https://github.com/coreos/etcd/releases/tag/v3.1.7) (2017-04-28)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.6...v3.1.7) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-## [v3.1.6](https://github.com/coreos/etcd/releases/tag/v3.1.6) (2017-04-19)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.5...v3.1.6) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### etcd server
-
-- Fill in Auth API response header.
-- Remove auth check in Status API.
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-## [v3.1.5](https://github.com/coreos/etcd/releases/tag/v3.1.5) (2017-03-27)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.4...v3.1.5) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### etcd server
-
-- Fix raft memory leak issue.
-- Fix Windows file path issues.
-
-### Other
-
-- Add `/etc/nsswitch.conf` file to alpine-based Docker image.
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-## [v3.1.4](https://github.com/coreos/etcd/releases/tag/v3.1.4) (2017-03-22)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.3...v3.1.4) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-## [v3.1.3](https://github.com/coreos/etcd/releases/tag/v3.1.3) (2017-03-10)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.2...v3.1.3) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### etcd gateway
-
-- Fix `etcd gateway` schema handling in DNS discovery.
-- Fix sd_notify behaviors in `gateway`, `grpc-proxy`.
-
-### gRPC Proxy
-
-- Fix sd_notify behaviors in `gateway`, `grpc-proxy`.
-
-### Other
-
-- Use machine default host when advertise URLs are default values(`localhost:2379,2380`) AND if listen URL is `0.0.0.0`.
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-## [v3.1.2](https://github.com/coreos/etcd/releases/tag/v3.1.2) (2017-02-24)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.1...v3.1.2) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### etcd gateway
-
-- Fix `etcd gateway` with multiple endpoints.
-
-### Other
-
-- Use IPv4 default host, by default (when IPv4 and IPv6 are available).
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-## [v3.1.1](https://github.com/coreos/etcd/releases/tag/v3.1.1) (2017-02-17)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.0...v3.1.1) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### Go
-
-- Compile with [*Go 1.7.5*](https://golang.org/doc/devel/release.html#go1.7).
-
-
-## [v3.1.0](https://github.com/coreos/etcd/releases/tag/v3.1.0) (2017-01-20)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.0.0...v3.1.0) and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.1 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_1.md).**
-
-### Improved
-
-- Faster linearizable reads (implements Raft [read-index](https://github.com/coreos/etcd/pull/6212)).
-- v3 authentication API is now stable.
-
-### Breaking Changes
-
-- Deprecated following gRPC metrics in favor of [go-grpc-prometheus](https://github.com/grpc-ecosystem/go-grpc-prometheus).
-  - `etcd_grpc_requests_total`
-  - `etcd_grpc_requests_failed_total`
-  - `etcd_grpc_active_streams`
-  - `etcd_grpc_unary_requests_duration_seconds`
-
-### Dependency
-
-- Upgrade [`github.com/ugorji/go/codec`](https://github.com/ugorji/go) to [**`ugorji/go@9c7f9b7`**](https://github.com/ugorji/go/commit/9c7f9b7a2bc3a520f7c7b30b34b7f85f47fe27b6), and [regenerate v2 `client`](https://github.com/coreos/etcd/pull/6945).
-
-### Security, Authentication
-
-See [security doc](https://github.com/coreos/etcd/blob/master/Documentation/op-guide/security.md) for more details.
-
-- SRV records (e.g., infra1.example.com) must match the discovery domain (i.e., example.com) if no custom certificate authority is given.
-  - `TLSConfig.ServerName` is ignored with user-provided certificates for backwards compatibility; to be deprecated.
-  - For example, `etcd --discovery-srv=example.com` will only authenticate peers/clients when the provided certs have root domain `example.com` as an entry in Subject Alternative Name (SAN) field.
-
-### etcd server
-
-- Automatic leadership transfer when leader steps down.
-- etcd flags
-  - `--strict-reconfig-check` flag is set by default.
-  - Add `--log-output` flag.
-  - Add `--metrics` flag.
-- etcd uses default route IP if advertise URL is not given.
-- Cluster rejects removing members if quorum will be lost.
-- Discovery now has upper limit for waiting on retries.
-- Warn on binding listeners through domain names; to be deprecated.
-- v3.0 and v3.1 with `--auto-compaction-retention=10` run periodic compaction on v3 key-value store for every 10-hour.
-  - Compactor only supports periodic compaction.
-  - Compactor records latest revisions every 5-minute, until it reaches the first compaction period (e.g. 10-hour).
-  - In order to retain key-value history of last compaction period, it uses the last revision that was fetched before compaction period, from the revision records that were collected every 5-minute.
-  - When `--auto-compaction-retention=10`, compactor uses revision 100 for compact revision where revision 100 is the latest revision fetched from 10 hours ago.
-  - If compaction succeeds or requested revision has already been compacted, it resets period timer and starts over with new historical revision records (e.g. restart revision collect and compact for the next 10-hour period).
-  - If compaction fails, it retries in 5 minutes.
-
-### client v3
-
-- Add `SetEndpoints` method; update endpoints at runtime.
-- Add `Sync` method; auto-update endpoints at runtime.
-- Add `Lease TimeToLive` API; fetch lease information.
-- replace Config.Logger field with global logger.
-- Get API responses are sorted in ascending order by default.
-
-### etcdctl v3
-
-- Add `lease timetolive` command.
-- Add `--print-value-only` flag to get command.
-- Add `--dest-prefix` flag to make-mirror command.
-- `get` command responses are sorted in ascending order by default.
-
-### gRPC Proxy
-
-- Experimental gRPC proxy feature.
-
-### Other
-
-- `recipes` now conform to sessions defined in `clientv3/concurrency`.
-- ACI has symlinks to `/usr/local/bin/etcd*`.
-
-### Go
-
-- Compile with [*Go 1.7.4*](https://golang.org/doc/devel/release.html#go1.7).
-

CHANGELOG-3.2.md

@@ -1,665 +0,0 @@
-
-
-Previous change logs can be found at [CHANGELOG-3.1](https://github.com/coreos/etcd/blob/master/CHANGELOG-3.1.md).
-
-## [v3.2.24](https://github.com/coreos/etcd/releases/tag/v3.2.24) (2018-07-24)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.23...v3.2.24) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Improved
-
-- Improve [Raft Read Index timeout warning messages](https://github.com/coreos/etcd/pull/9897).
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-2) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd_server_go_version`](https://github.com/coreos/etcd/pull/9957) Prometheus metric.
-- Add [`etcd_server_heartbeat_send_failures_total`](https://github.com/coreos/etcd/pull/9942) Prometheus metric.
-- Add [`etcd_server_slow_apply_total`](https://github.com/coreos/etcd/pull/9942) Prometheus metric.
-- Add [`etcd_disk_backend_defrag_duration_seconds`](https://github.com/coreos/etcd/pull/9942) Prometheus metric.
-- Add [`etcd_mvcc_hash_duration_seconds`](https://github.com/coreos/etcd/pull/9942) Prometheus metric.
-- Add [`etcd_server_slow_read_indexes_total`](https://github.com/coreos/etcd/pull/9897) Prometheus metric.
-- Add [`etcd_server_quota_backend_bytes`](https://github.com/coreos/etcd/pull/9820) Prometheus metric.
-  - Use it with `etcd_mvcc_db_total_size_in_bytes` and `etcd_mvcc_db_total_size_in_use_in_bytes`.
-  - `etcd_server_quota_backend_bytes 2.147483648e+09` means current quota size is 2 GB.
-  - `etcd_mvcc_db_total_size_in_bytes 20480` means current physically allocated DB size is 20 KB.
-  - `etcd_mvcc_db_total_size_in_use_in_bytes 16384` means future DB size if defragment operation is complete.
-  - `etcd_mvcc_db_total_size_in_bytes - etcd_mvcc_db_total_size_in_use_in_bytes` is the number of bytes that can be saved on disk with defragment operation.
-- Add [`etcd_mvcc_db_total_size_in_bytes`](https://github.com/coreos/etcd/pull/9819) Prometheus metric.
-  - In addition to [`etcd_debugging_mvcc_db_total_size_in_bytes`](https://github.com/coreos/etcd/pull/9819).
-- Add [`etcd_mvcc_db_total_size_in_use_in_bytes`](https://github.com/coreos/etcd/pull/9256) Prometheus metric.
-  - Use it with `etcd_mvcc_db_total_size_in_bytes` and `etcd_server_quota_backend_bytes`.
-  - `etcd_server_quota_backend_bytes 2.147483648e+09` means current quota size is 2 GB.
-  - `etcd_mvcc_db_total_size_in_bytes 20480` means current physically allocated DB size is 20 KB.
-  - `etcd_mvcc_db_total_size_in_use_in_bytes 16384` means future DB size if defragment operation is complete.
-  - `etcd_mvcc_db_total_size_in_bytes - etcd_mvcc_db_total_size_in_use_in_bytes` is the number of bytes that can be saved on disk with defragment operation.
-
-### gRPC Proxy
-
-- Add [flags for specifying TLS for connecting to proxy](https://github.com/coreos/etcd/pull/9894):
-  - Add `grpc-proxy start --cert-file`, `grpc-proxy start --key-file` and `grpc-proxy start --trusted-ca-file` flags.
-- Add [`grpc-proxy start --metrics-addr` flag for specifying a separate metrics listen address](https://github.com/coreos/etcd/pull/9894).
-
-### client v3
-
-- Fix [lease keepalive interval updates when response queue is full](https://github.com/coreos/etcd/pull/9952).
-  - If `<-chan *clientv3LeaseKeepAliveResponse` from `clientv3.Lease.KeepAlive` was never consumed or channel is full, client was [sending keepalive request every 500ms](https://github.com/coreos/etcd/issues/9911) instead of expected rate of every "TTL / 3" duration.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.23](https://github.com/coreos/etcd/releases/tag/v3.2.23) (2018-06-15)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.22...v3.2.23) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Improved
-
-- Improve [slow request apply warning log](https://github.com/coreos/etcd/pull/9288).
-  - e.g. `read-only range request "key:\"/a\" range_end:\"/b\" " with result "range_response_count:3 size:96" took too long (97.966µs) to execute`.
-  - Redact [request value field](https://github.com/coreos/etcd/pull/9822).
-  - Provide [response size](https://github.com/coreos/etcd/pull/9826).
-- Add [backoff on watch retries on transient errors](https://github.com/coreos/etcd/pull/9840).
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-2) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd_server_version`](https://github.com/coreos/etcd/pull/8960) Prometheus metric.
-  - To replace [Kubernetes `etcd-version-monitor`](https://github.com/coreos/etcd/issues/8948).
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.22](https://github.com/coreos/etcd/releases/tag/v3.2.22) (2018-06-06)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.21...v3.2.22) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Security, Authentication
-
-- Support TLS cipher suite whitelisting.
-  - To block [weak cipher suites](https://github.com/coreos/etcd/issues/8320).
-  - TLS handshake fails when client hello is requested with invalid cipher suites.
-  - Add [`etcd --cipher-suites`](https://github.com/coreos/etcd/pull/9801) flag.
-  - If empty, Go auto-populates the list.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.21](https://github.com/coreos/etcd/releases/tag/v3.2.21) (2018-05-31)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.20...v3.2.21) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### etcd server
-
-- Fix [auth storage panic when simple token provider is disabled](https://github.com/coreos/etcd/pull/8695).
-- Fix [`mvcc` server panic from restore operation](https://github.com/coreos/etcd/pull/9775).
-  - Let's assume that a watcher had been requested with a future revision X and sent to node A that became network-partitioned thereafter. Meanwhile, cluster makes progress. Then when the partition gets removed, the leader sends a snapshot to node A. Previously if the snapshot's latest revision is still lower than the watch revision X,  **etcd server panicked** during snapshot restore operation.
-  - Now, this server-side panic has been fixed.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.20](https://github.com/coreos/etcd/releases/tag/v3.2.20) (2018-05-09)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.19...v3.2.20) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### etcd server
-
-- Purge old [`*.snap.db` snapshot files](https://github.com/coreos/etcd/pull/7967).
-  - Previously, etcd did not respect `--max-snapshots` flag to purge old `*.snap.db` files.
-  - Now, etcd purges old `*.snap.db` files to keep maximum `--max-snapshots` number of files on disk.
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.19](https://github.com/coreos/etcd/releases/tag/v3.2.19) (2018-04-24)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.18...v3.2.19) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-2) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Fix [`etcd_debugging_server_lease_expired_total`](https://github.com/coreos/etcd/pull/9557) Prometheus metric.
-- Fix [race conditions in v2 server stat collecting](https://github.com/coreos/etcd/pull/9562).
-- Add [`etcd_server_is_leader`](https://github.com/coreos/etcd/pull/9587) Prometheus metric.
-
-### Security, Authentication
-
-- Fix [TLS reload](https://github.com/coreos/etcd/pull/9570) when [certificate SAN field only includes IP addresses but no domain names](https://github.com/coreos/etcd/issues/9541).
-  - In Go, server calls `(*tls.Config).GetCertificate` for TLS reload if and only if server's `(*tls.Config).Certificates` field is not empty, or `(*tls.ClientHelloInfo).ServerName` is not empty with a valid SNI from the client. Previously, etcd always populates `(*tls.Config).Certificates` on the initial client TLS handshake, as non-empty. Thus, client was always expected to supply a matching SNI in order to pass the TLS verification and to trigger `(*tls.Config).GetCertificate` to reload TLS assets.
-  - However, a certificate whose SAN field does [not include any domain names but only IP addresses](https://github.com/coreos/etcd/issues/9541) would request `*tls.ClientHelloInfo` with an empty `ServerName` field, thus failing to trigger the TLS reload on initial TLS handshake; this becomes a problem when expired certificates need to be replaced online.
-  - Now, `(*tls.Config).Certificates` is created empty on initial TLS client handshake, first to trigger `(*tls.Config).GetCertificate`, and then to populate rest of the certificates on every new TLS connection, even when client SNI is empty (e.g. cert only includes IPs).
-
-### etcd server
-
-- Add [`etcd --initial-election-tick-advance`](https://github.com/coreos/etcd/pull/9591) flag to configure initial election tick fast-forward.
-  - By default, `etcd --initial-election-tick-advance=true`, then local member fast-forwards election ticks to speed up "initial" leader election trigger.
-  - This benefits the case of larger election ticks. For instance, cross datacenter deployment may require longer election timeout of 10-second. If true, local node does not need wait up to 10-second. Instead, forwards its election ticks to 8-second, and have only 2-second left before leader election.
-  - Major assumptions are that: cluster has no active leader thus advancing ticks enables faster leader election. Or cluster already has an established leader, and rejoining follower is likely to receive heartbeats from the leader after tick advance and before election timeout.
-  - However, when network from leader to rejoining follower is congested, and the follower does not receive leader heartbeat within left election ticks, disruptive election has to happen thus affecting cluster availabilities.
-  - Now, this can be disabled by setting `--initial-election-tick-advance=false`.
-  - Disabling this would slow down initial bootstrap process for cross datacenter deployments. Make tradeoffs by configuring `--initial-election-tick-advance` at the cost of slow initial bootstrap.
-  - If single-node, it advances ticks regardless.
-  - Address [disruptive rejoining follower node](https://github.com/coreos/etcd/issues/9333).
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.18](https://github.com/coreos/etcd/releases/tag/v3.2.18) (2018-03-29)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.17...v3.2.18) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Improved
-
-- Adjust [election timeout on server restart](https://github.com/coreos/etcd/pull/9415) to reduce [disruptive rejoining servers](https://github.com/coreos/etcd/issues/9333).
-  - Previously, etcd fast-forwards election ticks on server start, with only one tick left for leader election. This is to speed up start phase, without having to wait until all election ticks elapse. Advancing election ticks is useful for cross datacenter deployments with larger election timeouts. However, it was affecting cluster availability if the last tick elapses before leader contacts the restarted node.
-  - Now, when etcd restarts, it adjusts election ticks with more than one tick left, thus more time for leader to prevent disruptive restart.
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-2) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add missing [`etcd_network_peer_sent_failures_total` count](https://github.com/coreos/etcd/pull/9437).
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.17](https://github.com/coreos/etcd/releases/tag/v3.2.17) (2018-03-08)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.16...v3.2.17) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### etcd server
-
-- Fix [server panic on invalid Election Proclaim/Resign HTTP(S) requests](https://github.com/coreos/etcd/pull/9379).
-  - Previously, wrong-formatted HTTP requests to Election API could trigger panic in etcd server.
-  - e.g. `curl -L http://localhost:2379/v3/election/proclaim -X POST -d '{"value":""}'`, `curl -L http://localhost:2379/v3/election/resign -X POST -d '{"value":""}'`.
-- Prevent [overflow by large `TTL` values for `Lease` `Grant`](https://github.com/coreos/etcd/pull/9399).
-  - `TTL` parameter to `Grant` request is unit of second.
-  - Leases with too large `TTL` values exceeding `math.MaxInt64` [expire in unexpected ways](https://github.com/coreos/etcd/issues/9374).
-  - Server now returns `rpctypes.ErrLeaseTTLTooLarge` to client, when the requested `TTL` is larger than *9,000,000,000 seconds* (which is >285 years).
-  - Again, etcd `Lease` is meant for short-periodic keepalives or sessions, in the range of seconds or minutes. Not for hours or days!
-- Enable etcd server [`raft.Config.CheckQuorum` when starting with `ForceNewCluster`](https://github.com/coreos/etcd/pull/9347).
-
-### Proxy v2
-
-- Fix [v2 proxy leaky HTTP requests](https://github.com/coreos/etcd/pull/9336).
-
-### Go
-
-- Compile with [*Go 1.8.7*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.16](https://github.com/coreos/etcd/releases/tag/v3.2.16) (2018-02-12)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.15...v3.2.16) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### etcd server
-
-- Fix [`mvcc` "unsynced" watcher restore operation](https://github.com/coreos/etcd/pull/9297).
-  - "unsynced" watcher is watcher that needs to be in sync with events that have happened.
-  - That is, "unsynced" watcher is the slow watcher that was requested on old revision.
-  - "unsynced" watcher restore operation was not correctly populating its underlying watcher group.
-  - Which possibly causes [missing events from "unsynced" watchers](https://github.com/coreos/etcd/issues/9086).
-  - A node gets network partitioned with a watcher on a future revision, and falls behind receiving a leader snapshot after partition gets removed. When applying this snapshot, etcd watch storage moves current synced watchers to unsynced since sync watchers might have become stale during network partition. And reset synced watcher group to restart watcher routines. Previously, there was a bug when moving from synced watcher group to unsynced, thus client would miss events when the watcher was requested to the network-partitioned node.
-
-### Go
-
-- Compile with [*Go 1.8.5*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.15](https://github.com/coreos/etcd/releases/tag/v3.2.15) (2018-01-22)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.14...v3.2.15) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### etcd server
-
-- Prevent [server panic from member update/add](https://github.com/coreos/etcd/pull/9174) with [wrong scheme URLs](https://github.com/coreos/etcd/issues/9173).
-- Log [user context cancel errors on stream APIs in debug level with TLS](https://github.com/coreos/etcd/pull/9178).
-
-### Go
-
-- Compile with [*Go 1.8.5*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.14](https://github.com/coreos/etcd/releases/tag/v3.2.14) (2018-01-11)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.13...v3.2.14) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Improved
-
-- Log [user context cancel errors on stream APIs in debug level](https://github.com/coreos/etcd/pull/9105).
-
-### etcd server
-
-- Fix [`mvcc/backend.defragdb` nil-pointer dereference on create bucket failure](https://github.com/coreos/etcd/pull/9119).
-
-### Go
-
-- Compile with [*Go 1.8.5*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.13](https://github.com/coreos/etcd/releases/tag/v3.2.13) (2018-01-02)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.12...v3.2.13) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### etcd server
-
-- Remove [verbose error messages on stream cancel and gRPC info-level logs](https://github.com/coreos/etcd/pull/9080) in server-side.
-- Fix [gRPC server panic on `GracefulStop` TLS-enabled server](https://github.com/coreos/etcd/pull/8987).
-
-### Go
-
-- Compile with [*Go 1.8.5*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.12](https://github.com/coreos/etcd/releases/tag/v3.2.12) (2017-12-20)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.11...v3.2.12) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Dependency
-
-- Upgrade [`google.golang.org/grpc`](https://github.com/grpc/grpc-go/releases/tag) from [**`v1.7.4`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.4) to [**`v1.7.5`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.5).
-- Upgrade [`github.com/grpc-ecosystem/grpc-gateway`](https://github.com/grpc-ecosystem/grpc-gateway/releases) from [**`v1.3`**](https://github.com/grpc-ecosystem/grpc-gateway/releases/tag/v1.3) to [**`v1.3.0`**](https://github.com/grpc-ecosystem/grpc-gateway/releases/tag/v1.3.0).
-
-### etcd server
-
-- Fix [error message of `Revision` compactor](https://github.com/coreos/etcd/pull/8999) in server-side.
-
-### client v3
-
-- Add [`MaxCallSendMsgSize` and `MaxCallRecvMsgSize`](https://github.com/coreos/etcd/pull/9047) fields to [`clientv3.Config`](https://godoc.org/github.com/coreos/etcd/clientv3#Config).
-  - Fix [exceeded response size limit error in client-side](https://github.com/coreos/etcd/issues/9043).
-  - Address [kubernetes#51099](https://github.com/kubernetes/kubernetes/issues/51099).
-    - In previous versions(v3.2.10, v3.2.11), client response size was limited to only 4 MiB.
-  - `MaxCallSendMsgSize` default value is 2 MiB, if not configured.
-  - `MaxCallRecvMsgSize` default value is `math.MaxInt32`, if not configured.
-
-### Go
-
-- Compile with [*Go 1.8.5*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.11](https://github.com/coreos/etcd/releases/tag/v3.2.11) (2017-12-05)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.10...v3.2.11) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Dependency
-
-- Upgrade [`google.golang.org/grpc`](https://github.com/grpc/grpc-go/releases/tag) from [**`v1.7.3`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.3) to [**`v1.7.4`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.4).
-
-### Security, Authentication
-
-See [security doc](https://github.com/coreos/etcd/blob/master/Documentation/op-guide/security.md) for more details.
-
-- Log [more details on TLS handshake failures](https://github.com/coreos/etcd/pull/8952/files).
-
-### client v3
-
-- Fix racey grpc-go's server handler transport `WriteStatus` call to prevent [TLS-enabled etcd server crash](https://github.com/coreos/etcd/issues/8904).
-- Add [gRPC RPC failure warnings](https://github.com/coreos/etcd/pull/8939) to help debug such issues in the future.
-
-### Documentation
-
-- Remove `--listen-metrics-urls` flag in monitoring document (non-released in `v3.2.x`, planned for `v3.3.x`).
-
-### Go
-
-- Compile with [*Go 1.8.5*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.10](https://github.com/coreos/etcd/releases/tag/v3.2.10) (2017-11-16)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.9...v3.2.10) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Dependency
-
-- Upgrade [`google.golang.org/grpc`](https://github.com/grpc/grpc-go/releases/tag) from [**`v1.2.1`**](https://github.com/grpc/grpc-go/releases/tag/v1.2.1) to [**`v1.7.3`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.3).
-- Upgrade [`github.com/grpc-ecosystem/grpc-gateway`](https://github.com/grpc-ecosystem/grpc-gateway/releases) from [**`v1.2.0`**](https://github.com/grpc-ecosystem/grpc-gateway/releases/tag/v1.2.0) to [**`v1.3`**](https://github.com/grpc-ecosystem/grpc-gateway/releases/tag/v1.3).
-
-### Security, Authentication
-
-See [security doc](https://github.com/coreos/etcd/blob/master/Documentation/op-guide/security.md) for more details.
-
-- Revert [discovery SRV auth `ServerName` with `*.{ROOT_DOMAIN}`](https://github.com/coreos/etcd/pull/8651) to support non-wildcard subject alternative names in the certs (see [issue #8445](https://github.com/coreos/etcd/issues/8445) for more contexts).
-  - For instance, `etcd --discovery-srv=etcd.local` will only authenticate peers/clients when the provided certs have root domain `etcd.local` (**not `*.etcd.local`**) as an entry in Subject Alternative Name (SAN) field.
-
-### etcd server
-
-- Replace backend key-value database `boltdb/bolt` with [`coreos/bbolt`](https://github.com/coreos/bbolt/releases) to address [backend database size issue](https://github.com/coreos/etcd/issues/8009).
-
-### client v3
-
-- Rewrite balancer to handle [network partitions](https://github.com/coreos/etcd/issues/8711).
-
-### Go
-
-- Compile with [*Go 1.8.5*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.9](https://github.com/coreos/etcd/releases/tag/v3.2.9) (2017-10-06)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.8...v3.2.9) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Security, Authentication
-
-See [security doc](https://github.com/coreos/etcd/blob/master/Documentation/op-guide/security.md) for more details.
-
-- Update `golang.org/x/crypto/bcrypt` (see [golang/crypto@6c586e1](https://github.com/golang/crypto/commit/6c586e17d90a7d08bbbc4069984180dce3b04117)).
-- Fix discovery SRV bootstrapping to [authenticate `ServerName` with `*.{ROOT_DOMAIN}`](https://github.com/coreos/etcd/pull/8651), in order to support sub-domain wildcard matching (see [issue #8445](https://github.com/coreos/etcd/issues/8445) for more contexts).
-  - For instance, `etcd --discovery-srv=etcd.local` will only authenticate peers/clients when the provided certs have root domain `*.etcd.local` as an entry in Subject Alternative Name (SAN) field.
-
-### Go
-
-- Compile with [*Go 1.8.4*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.8](https://github.com/coreos/etcd/releases/tag/v3.2.8) (2017-09-29)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.7...v3.2.8) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### client v2
-
-- Fix v2 client failover to next endpoint on mutable operation.
-
-### gRPC Proxy
-
-- Handle [`KeysOnly` flag](https://github.com/coreos/etcd/pull/8552).
-
-### Go
-
-- Compile with [*Go 1.8.3*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.7](https://github.com/coreos/etcd/releases/tag/v3.2.7) (2017-09-01)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.6...v3.2.7) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Security, Authentication
-
-- Fix [server-side auth so concurrent auth operations do not return old revision error](https://github.com/coreos/etcd/pull/8306).
-
-### client v3
-
-- Fix [`concurrency/stm` Put with serializable snapshot](https://github.com/coreos/etcd/pull/8439).
-  - Use store revision from first fetch to resolve write conflicts instead of modified revision.
-
-### Go
-
-- Compile with [*Go 1.8.3*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.6](https://github.com/coreos/etcd/releases/tag/v3.2.6) (2017-08-21)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.5...v3.2.6) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### etcd server
-
-- Fix watch restore from snapshot.
-- Fix multiple URLs for `--listen-peer-urls` flag.
-- Add `--enable-pprof` flag to etcd configuration file format.
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-2) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Fix `etcd_debugging_mvcc_keys_total` inconsistency.
-
-### Go
-
-- Compile with [*Go 1.8.3*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.5](https://github.com/coreos/etcd/releases/tag/v3.2.5) (2017-08-04)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.4...v3.2.5) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### etcdctl v3
-
-- Return non-zero exit code on unhealthy `endpoint health`.
-
-### Security, Authentication
-
-See [security doc](https://github.com/coreos/etcd/blob/master/Documentation/op-guide/security.md) for more details.
-
-- [Server supports reverse-lookup on wildcard DNS `SAN`](https://github.com/coreos/etcd/pull/8281). For instance, if peer cert contains only DNS names (no IP addresses) in Subject Alternative Name (SAN) field, server first reverse-lookups the remote IP address to get a list of names mapping to that address (e.g. `nslookup IPADDR`). Then accepts the connection if those names have a matching name with peer cert's DNS names (either by exact or wildcard match). If none is matched, server forward-lookups each DNS entry in peer cert (e.g. look up `example.default.svc` when the entry is `*.example.default.svc`), and accepts connection only when the host's resolved addresses have the matching IP address with the peer's remote IP address. For example, peer B's CSR (with `cfssl`) SAN field is `["*.example.default.svc", "*.example.default.svc.cluster.local"]` when peer B's remote IP address is `10.138.0.2`. When peer B tries to join the cluster, peer A reverse-lookup the IP `10.138.0.2` to get the list of host names. And either exact or wildcard match the host names with peer B's cert DNS names in Subject Alternative Name (SAN) field. If none of reverse/forward lookups worked, it returns an error `"tls: "10.138.0.2" does not match any of DNSNames ["*.example.default.svc","*.example.default.svc.cluster.local"]`. See [issue#8268](https://github.com/coreos/etcd/issues/8268) for more detail.
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-2) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Fix unreachable `/metrics` endpoint when `--enable-v2=false`.
-
-### gRPC Proxy
-
-- Handle [`PrevKv` flag](https://github.com/coreos/etcd/pull/8366).
-
-### Other
-
-- Add container registry `gcr.io/etcd-development/etcd`.
-
-### Go
-
-- Compile with [*Go 1.8.3*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.4](https://github.com/coreos/etcd/releases/tag/v3.2.4) (2017-07-19)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.3...v3.2.4) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### etcd server
-
-- Do not block on active client stream when stopping server
-
-### gRPC proxy
-
-- Fix gRPC proxy Snapshot RPC error handling
-
-### Go
-
-- Compile with [*Go 1.8.3*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.3](https://github.com/coreos/etcd/releases/tag/v3.2.3) (2017-07-14)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.2...v3.2.3) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### client v3
-
-- Let clients establish unlimited streams
-
-### Other
-
-- Tag docker images with minor versions
-  - e.g. `docker pull quay.io/coreos/etcd:v3.2` to fetch latest v3.2 versions
-
-### Go
-
-- Compile with [*Go 1.8.3*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.2](https://github.com/coreos/etcd/releases/tag/v3.2.2) (2017-07-07)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.1...v3.2.2) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Improved
-
-- Rate-limit lease revoke on expiration.
-- Extend leases on promote to avoid queueing effect on lease expiration.
-
-### Security, Authentication
-
-See [security doc](https://github.com/coreos/etcd/blob/master/Documentation/op-guide/security.md) for more details.
-
-- [Server accepts connections if IP matches, without checking DNS entries](https://github.com/coreos/etcd/pull/8223). For instance, if peer cert contains IP addresses and DNS names in Subject Alternative Name (SAN) field, and the remote IP address matches one of those IP addresses, server just accepts connection without further checking the DNS names. For example, peer B's CSR (with `cfssl`) SAN field is `["invalid.domain", "10.138.0.2"]` when peer B's remote IP address is `10.138.0.2` and `invalid.domain` is a invalid host. When peer B tries to join the cluster, peer A successfully authenticates B, since Subject Alternative Name (SAN) field has a valid matching IP address. See [issue#8206](https://github.com/coreos/etcd/issues/8206) for more detail.
-
-### etcd server
-
-- Accept connection with matched IP SAN but no DNS match.
-  - Don't check DNS entries in certs if there's a matching IP.
-
-### gRPC gateway
-
-- Use user-provided listen address to connect to gRPC gateway.
-  - `net.Listener` rewrites IPv4 0.0.0.0 to IPv6 [::], breaking IPv6 disabled hosts.
-  - Only v3.2.0, v3.2.1 are affected.
-
-### Go
-
-- Compile with [*Go 1.8.3*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.1](https://github.com/coreos/etcd/releases/tag/v3.2.1) (2017-06-23)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.0...v3.2.1) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### etcd server
-
-- Fix backend database in-memory index corruption issue on restore (only 3.2.0 is affected).
-
-### gRPC gateway
-
-- Fix Txn marshaling.
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-2) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Fix backend database size debugging metrics.
-
-### Go
-
-- Compile with [*Go 1.8.3*](https://golang.org/doc/devel/release.html#go1.8).
-
-
-## [v3.2.0](https://github.com/coreos/etcd/releases/tag/v3.2.0) (2017-06-09)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.1.0...v3.2.0) and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.2 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_2.md).**
-
-### Improved
-
-- Improve backend read concurrency.
-
-### Breaking Changes
-
-- Increased [`--snapshot-count` default value from 10,000 to 100,000](https://github.com/coreos/etcd/pull/7160).
-  - Higher snapshot count means it holds Raft entries in memory for longer before discarding old entries.
-  - It is a trade-off between less frequent snapshotting and [higher memory usage](https://github.com/kubernetes/kubernetes/issues/60589#issuecomment-371977156).
-  - User lower `--snapshot-count` value for lower memory usage.
-  - User higher `--snapshot-count` value for better availabilities of slow followers (less frequent snapshots from leader).
-- `clientv3.Lease.TimeToLive` returns `LeaseTimeToLiveResponse.TTL == -1` on lease not found.
-- `clientv3.NewFromConfigFile` is moved to `clientv3/yaml.NewConfig`.
-- `embed.Etcd.Peers` field is now `[]*peerListener`.
-- Rejects domains names for `--listen-peer-urls` and `--listen-client-urls` (3.1 only prints out warnings), since [domain name is invalid for network interface binding](https://github.com/coreos/etcd/issues/6336).
-
-### Dependency
-
-- Upgrade [`google.golang.org/grpc`](https://github.com/grpc/grpc-go/releases) from [**`v1.0.4`**](https://github.com/grpc/grpc-go/releases/tag/v1.0.4) to [**`v1.2.1`**](https://github.com/grpc/grpc-go/releases/tag/v1.2.1).
-- Upgrade [`github.com/grpc-ecosystem/grpc-gateway`](https://github.com/grpc-ecosystem/grpc-gateway/releases) to [**`v1.2.0`**](https://github.com/grpc-ecosystem/grpc-gateway/releases/tag/v1.2.0).
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-2) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd_disk_backend_snapshot_duration_seconds`](https://github.com/coreos/etcd/pull/7892)
-- Add `etcd_debugging_server_lease_expired_total` metrics.
-
-### Security, Authentication
-
-See [security doc](https://github.com/coreos/etcd/blob/master/Documentation/op-guide/security.md) for more details.
-
-- [TLS certificates get reloaded on every client connection](https://github.com/coreos/etcd/pull/7829). This is useful when replacing expiry certs without stopping etcd servers; it can be done by overwriting old certs with new ones. Refreshing certs for every connection should not have too much overhead, but can be improved in the future, with caching layer. Example tests can be found [here](https://github.com/coreos/etcd/blob/b041ce5d514a4b4aaeefbffb008f0c7570a18986/integration/v3_grpc_test.go#L1601-L1757).
-- [Server denies incoming peer certs with wrong IP `SAN`](https://github.com/coreos/etcd/pull/7687). For instance, if peer cert contains any IP addresses in Subject Alternative Name (SAN) field, server authenticates a peer only when the remote IP address matches one of those IP addresses. This is to prevent unauthorized endpoints from joining the cluster.  For example, peer B's CSR (with `cfssl`) SAN field is `["*.example.default.svc", "*.example.default.svc.cluster.local", "10.138.0.27"]` when peer B's actual IP address is `10.138.0.2`, not `10.138.0.27`. When peer B tries to join the cluster, peer A will reject B with the error `x509: certificate is valid for 10.138.0.27, not 10.138.0.2`, because B's remote IP address does not match the one in Subject Alternative Name (SAN) field.
-- [Server resolves TLS `DNSNames` when checking `SAN`](https://github.com/coreos/etcd/pull/7767). For instance, if peer cert contains only DNS names (no IP addresses) in Subject Alternative Name (SAN) field, server authenticates a peer only when forward-lookups (`dig b.com`) on those DNS names have matching IP with the remote IP address.  For example, peer B's CSR (with `cfssl`) SAN field is `["b.com"]` when peer B's remote IP address is `10.138.0.2`. When peer B tries to join the cluster, peer A looks up the incoming host `b.com` to get the list of IP addresses (e.g. `dig b.com`). And rejects B if the list does not contain the IP `10.138.0.2`, with the error `tls: 10.138.0.2 does not match any of DNSNames ["b.com"]`.
-- Auth support JWT token.
-
-### etcd server
-
-- RPCs
-  - Add Election, Lock service.
-- Native client `etcdserver/api/v3client`
-  - client "embedded" in the server.
-- Logging, monitoring
-  - Server warns large snapshot operations.
-- Add `etcd --enable-v2` flag to enable v2 API server.
-  - `etcd --enable-v2=true` by default.
-- Add `etcd --auth-token` flag.
-- v3.2 compactor runs [every hour](https://github.com/coreos/etcd/pull/7875).
-  - Compactor only supports periodic compaction.
-  - Compactor continues to record latest revisions every 5-minute.
-  - For every hour, it uses the last revision that was fetched before compaction period, from the revision records that were collected every 5-minute.
-  - That is, for every hour, compactor discards historical data created before compaction period.
-  - The retention window of compaction period moves to next hour.
-  - For instance, when hourly writes are 100 and `--auto-compaction-retention=10`, v3.1 compacts revision 1000, 2000, and 3000 for every 10-hour, while v3.2 compacts revision 1000, 1100, and 1200 for every 1-hour.
-  - If compaction succeeds or requested revision has already been compacted, it resets period timer and removes used compacted revision from historical revision records (e.g. start next revision collect and compaction from previously collected revisions).
-  - If compaction fails, it retries in 5 minutes.
-- Allow snapshot over 512MB.
-
-### client v3
-
-- STM prefetching.
-- Add namespace feature.
-- Add `ErrOldCluster` with server version checking.
-- Translate `WithPrefix()` into `WithFromKey()` for empty key.
-
-### etcdctl v3
-
-- Add `check perf` command.
-- Add `etcdctl --from-key` flag to role grant-permission command.
-- `lock` command takes an optional command to execute.
-
-### gRPC Proxy
-
-- Proxy endpoint discovery.
-- Namespaces.
-- Coalesce lease requests.
-
-### etcd gateway
-
-- Support [DNS SRV priority](https://github.com/coreos/etcd/pull/7882) for [smart proxy routing](https://github.com/coreos/etcd/issues/4378).
-
-### Other
-
-- v3 client
-  - concurrency package's elections updated to match RPC interfaces.
-  - let client dial endpoints not in the balancer.
-- Release
-  - Annotate acbuild with supports-systemd-notify.
-  - Add `nsswitch.conf` to Docker container image.
-  - Add ppc64le, arm64(experimental) builds.
-
-### Go
-
-- Compile with [*Go 1.8.3*](https://golang.org/doc/devel/release.html#go1.8).
-

CHANGELOG-3.3.md

@@ -1,521 +0,0 @@
-
-
-Previous change logs can be found at [CHANGELOG-3.2](https://github.com/coreos/etcd/blob/master/CHANGELOG-3.2.md).
-
-
-## [v3.3.9](https://github.com/coreos/etcd/releases/tag/v3.3.9) (2018-07-24)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.3.8...v3.3.9) and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md).**
-
-### Improved
-
-- Improve [Raft Read Index timeout warning messages](https://github.com/coreos/etcd/pull/9897).
-
-### Security, Authentication
-
-- Compile with [*Go 1.10.3*](https://golang.org/doc/devel/release.html#go1.10) to support [crypto/x509 "Name Constraints"](https://github.com/coreos/etcd/issues/9912).
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-3) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd_server_go_version`](https://github.com/coreos/etcd/pull/9957) Prometheus metric.
-- Add [`etcd_server_heartbeat_send_failures_total`](https://github.com/coreos/etcd/pull/9940) Prometheus metric.
-- Add [`etcd_server_slow_apply_total`](https://github.com/coreos/etcd/pull/9940) Prometheus metric.
-- Add [`etcd_disk_backend_defrag_duration_seconds`](https://github.com/coreos/etcd/pull/9940) Prometheus metric.
-- Add [`etcd_mvcc_hash_duration_seconds`](https://github.com/coreos/etcd/pull/9940) Prometheus metric.
-- Add [`etcd_mvcc_hash_rev_duration_seconds`](https://github.com/coreos/etcd/pull/9940) Prometheus metric.
-- Add [`etcd_server_slow_read_indexes_total`](https://github.com/coreos/etcd/pull/9897) Prometheus metric.
-- Add [`etcd_server_quota_backend_bytes`](https://github.com/coreos/etcd/pull/9820) Prometheus metric.
-  - Use it with `etcd_mvcc_db_total_size_in_bytes` and `etcd_mvcc_db_total_size_in_use_in_bytes`.
-  - `etcd_server_quota_backend_bytes 2.147483648e+09` means current quota size is 2 GB.
-  - `etcd_mvcc_db_total_size_in_bytes 20480` means current physically allocated DB size is 20 KB.
-  - `etcd_mvcc_db_total_size_in_use_in_bytes 16384` means future DB size if defragment operation is complete.
-  - `etcd_mvcc_db_total_size_in_bytes - etcd_mvcc_db_total_size_in_use_in_bytes` is the number of bytes that can be saved on disk with defragment operation.
-- Add [`etcd_mvcc_db_total_size_in_bytes`](https://github.com/coreos/etcd/pull/9819) Prometheus metric.
-  - In addition to [`etcd_debugging_mvcc_db_total_size_in_bytes`](https://github.com/coreos/etcd/pull/9819).
-- Add [`etcd_mvcc_db_total_size_in_use_in_bytes`](https://github.com/coreos/etcd/pull/9256) Prometheus metric.
-  - Use it with `etcd_mvcc_db_total_size_in_bytes` and `etcd_mvcc_db_total_size_in_use_in_bytes`.
-  - `etcd_server_quota_backend_bytes 2.147483648e+09` means current quota size is 2 GB.
-  - `etcd_mvcc_db_total_size_in_bytes 20480` means current physically allocated DB size is 20 KB.
-  - `etcd_mvcc_db_total_size_in_use_in_bytes 16384` means future DB size if defragment operation is complete.
-  - `etcd_mvcc_db_total_size_in_bytes - etcd_mvcc_db_total_size_in_use_in_bytes` is the number of bytes that can be saved on disk with defragment operation.
-
-### client v3
-
-- Fix [lease keepalive interval updates when response queue is full](https://github.com/coreos/etcd/pull/9952).
-  - If `<-chan *clientv3LeaseKeepAliveResponse` from `clientv3.Lease.KeepAlive` was never consumed or channel is full, client was [sending keepalive request every 500ms](https://github.com/coreos/etcd/issues/9911) instead of expected rate of every "TTL / 3" duration.
-
-### Go
-
-- Compile with [*Go 1.10.3*](https://golang.org/doc/devel/release.html#go1.10).
-
-
-## [v3.3.8](https://github.com/coreos/etcd/releases/tag/v3.3.8) (2018-06-15)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.3.7...v3.3.8) and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md).**
-
-### Improved
-
-- Improve [slow request apply warning log](https://github.com/coreos/etcd/pull/9288).
-  - e.g. `read-only range request "key:\"/a\" range_end:\"/b\" " with result "range_response_count:3 size:96" took too long (97.966µs) to execute`.
-  - Redact [request value field](https://github.com/coreos/etcd/pull/9822).
-  - Provide [response size](https://github.com/coreos/etcd/pull/9826).
-- Add [backoff on watch retries on transient errors](https://github.com/coreos/etcd/pull/9840).
-
-### Go
-
-- Compile with [*Go 1.9.7*](https://golang.org/doc/devel/release.html#go1.9).
-
-
-## [v3.3.7](https://github.com/coreos/etcd/releases/tag/v3.3.7) (2018-06-06)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.3.6...v3.3.7) and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md).**
-
-### Security, Authentication
-
-- Support TLS cipher suite whitelisting.
-  - To block [weak cipher suites](https://github.com/coreos/etcd/issues/8320).
-  - TLS handshake fails when client hello is requested with invalid cipher suites.
-  - Add [`etcd --cipher-suites`](https://github.com/coreos/etcd/pull/9801) flag.
-  - If empty, Go auto-populates the list.
-
-### etcdctl v3
-
-- Fix [`etcdctl move-leader` command for TLS-enabled endpoints](https://github.com/coreos/etcd/pull/9807).
-
-### Go
-
-- Compile with [*Go 1.9.6*](https://golang.org/doc/devel/release.html#go1.9).
-
-
-## [v3.3.6](https://github.com/coreos/etcd/releases/tag/v3.3.6) (2018-05-31)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.3.5...v3.3.6) and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md).**
-
-### etcd server
-
-- Allow [empty auth token](https://github.com/coreos/etcd/pull/9369).
-  - Previously, when auth token is an empty string, it returns [`failed to initialize the etcd server: auth: invalid auth options` error](https://github.com/coreos/etcd/issues/9349).
-- Fix [auth storage panic on server lease revoke routine with JWT token](https://github.com/coreos/etcd/issues/9695).
-- Fix [`mvcc` server panic from restore operation](https://github.com/coreos/etcd/pull/9775).
-  - Let's assume that a watcher had been requested with a future revision X and sent to node A that became network-partitioned thereafter. Meanwhile, cluster makes progress. Then when the partition gets removed, the leader sends a snapshot to node A. Previously if the snapshot's latest revision is still lower than the watch revision X,  **etcd server panicked** during snapshot restore operation.
-  - Now, this server-side panic has been fixed.
-
-### Go
-
-- Compile with [*Go 1.9.6*](https://golang.org/doc/devel/release.html#go1.9).
-
-
-## [v3.3.5](https://github.com/coreos/etcd/releases/tag/v3.3.5) (2018-05-09)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.3.4...v3.3.5) and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md).**
-
-### etcdctl v3
-
-- Fix [`etcdctl watch [key] [range_end] -- [exec-command…]`](https://github.com/coreos/etcd/pull/9688) parsing.
-  - Previously,  `ETCDCTL_API=3 ./bin/etcdctl watch foo -- echo watch event received` panicked.
-
-### Go
-
-- Compile with [*Go 1.9.6*](https://golang.org/doc/devel/release.html#go1.9).
-
-
-## [v3.3.4](https://github.com/coreos/etcd/releases/tag/v3.3.4) (2018-04-24)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.3.3...v3.3.4) and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md).**
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-3) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd_server_is_leader`](https://github.com/coreos/etcd/pull/9587) Prometheus metric.
-- Fix [`etcd_debugging_server_lease_expired_total`](https://github.com/coreos/etcd/pull/9557) Prometheus metric.
-- Fix [race conditions in v2 server stat collecting](https://github.com/coreos/etcd/pull/9562).
-
-### Security, Authentication
-
-- Fix [TLS reload](https://github.com/coreos/etcd/pull/9570) when [certificate SAN field only includes IP addresses but no domain names](https://github.com/coreos/etcd/issues/9541).
-  - In Go, server calls `(*tls.Config).GetCertificate` for TLS reload if and only if server's `(*tls.Config).Certificates` field is not empty, or `(*tls.ClientHelloInfo).ServerName` is not empty with a valid SNI from the client. Previously, etcd always populates `(*tls.Config).Certificates` on the initial client TLS handshake, as non-empty. Thus, client was always expected to supply a matching SNI in order to pass the TLS verification and to trigger `(*tls.Config).GetCertificate` to reload TLS assets.
-  - However, a certificate whose SAN field does [not include any domain names but only IP addresses](https://github.com/coreos/etcd/issues/9541) would request `*tls.ClientHelloInfo` with an empty `ServerName` field, thus failing to trigger the TLS reload on initial TLS handshake; this becomes a problem when expired certificates need to be replaced online.
-  - Now, `(*tls.Config).Certificates` is created empty on initial TLS client handshake, first to trigger `(*tls.Config).GetCertificate`, and then to populate rest of the certificates on every new TLS connection, even when client SNI is empty (e.g. cert only includes IPs).
-
-### etcd server
-
-- Add [`etcd --initial-election-tick-advance`](https://github.com/coreos/etcd/pull/9591) flag to configure initial election tick fast-forward.
-  - By default, `etcd --initial-election-tick-advance=true`, then local member fast-forwards election ticks to speed up "initial" leader election trigger.
-  - This benefits the case of larger election ticks. For instance, cross datacenter deployment may require longer election timeout of 10-second. If true, local node does not need wait up to 10-second. Instead, forwards its election ticks to 8-second, and have only 2-second left before leader election.
-  - Major assumptions are that: cluster has no active leader thus advancing ticks enables faster leader election. Or cluster already has an established leader, and rejoining follower is likely to receive heartbeats from the leader after tick advance and before election timeout.
-  - However, when network from leader to rejoining follower is congested, and the follower does not receive leader heartbeat within left election ticks, disruptive election has to happen thus affecting cluster availabilities.
-  - Now, this can be disabled by setting `--initial-election-tick-advance=false`.
-  - Disabling this would slow down initial bootstrap process for cross datacenter deployments. Make tradeoffs by configuring `etcd --initial-election-tick-advance` at the cost of slow initial bootstrap.
-  - If single-node, it advances ticks regardless.
-  - Address [disruptive rejoining follower node](https://github.com/coreos/etcd/issues/9333).
-
-### Package `embed`
-
-- Add [`embed.Config.InitialElectionTickAdvance`](https://github.com/coreos/etcd/pull/9591) to enable/disable initial election tick fast-forward.
-  - `embed.NewConfig()` would return `*embed.Config` with `InitialElectionTickAdvance` as true by default.
-
-### Go
-
-- Compile with [*Go 1.9.5*](https://golang.org/doc/devel/release.html#go1.9).
-
-
-## [v3.3.3](https://github.com/coreos/etcd/releases/tag/v3.3.3) (2018-03-29)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.3.2...v3.3.3) and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md).**
-
-### Improved
-
-- Adjust [election timeout on server restart](https://github.com/coreos/etcd/pull/9415) to reduce [disruptive rejoining servers](https://github.com/coreos/etcd/issues/9333).
-  - Previously, etcd fast-forwards election ticks on server start, with only one tick left for leader election. This is to speed up start phase, without having to wait until all election ticks elapse. Advancing election ticks is useful for cross datacenter deployments with larger election timeouts. However, it was affecting cluster availability if the last tick elapses before leader contacts the restarted node.
-  - Now, when etcd restarts, it adjusts election ticks with more than one tick left, thus more time for leader to prevent disruptive restart.
-- Adjust [periodic compaction retention window](https://github.com/coreos/etcd/pull/9485).
-  - e.g. `etcd --auto-compaction-mode=revision --auto-compaction-retention=1000` automatically `Compact` on `"latest revision" - 1000` every 5-minute (when latest revision is 30000, compact on revision 29000).
-  - e.g. Previously, `etcd --auto-compaction-mode=periodic --auto-compaction-retention=72h` automatically `Compact` with 72-hour retention windown for every 7.2-hour. **Now, `Compact` happens, for every 1-hour but still with 72-hour retention window.**
-  - e.g. Previously, `etcd --auto-compaction-mode=periodic --auto-compaction-retention=30m` automatically `Compact` with 30-minute retention windown for every 3-minute. **Now, `Compact` happens, for every 30-minute but still with 30-minute retention window.**
-  - Periodic compactor keeps recording latest revisions for every compaction period when given period is less than 1-hour, or for every 1-hour when given compaction period is greater than 1-hour (e.g. 1-hour when `etcd --auto-compaction-mode=periodic --auto-compaction-retention=24h`).
-  - For every compaction period or 1-hour, compactor uses the last revision that was fetched before compaction period, to discard historical data.
-  - The retention window of compaction period moves for every given compaction period or hour.
-  - For instance, when hourly writes are 100 and `etcd --auto-compaction-mode=periodic --auto-compaction-retention=24h`, `v3.2.x`, `v3.3.0`, `v3.3.1`, and `v3.3.2` compact revision 2400, 2640, and 2880 for every 2.4-hour, while `v3.3.3` *or later* compacts revision 2400, 2500, 2600 for every 1-hour.
-  - Futhermore, when `etcd --auto-compaction-mode=periodic --auto-compaction-retention=30m` and writes per minute are about 1000, `v3.3.0`, `v3.3.1`, and `v3.3.2` compact revision 30000, 33000, and 36000, for every 3-minute, while `v3.3.3` *or later* compacts revision 30000, 60000, and 90000, for every 30-minute.
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-3) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add missing [`etcd_network_peer_sent_failures_total` count](https://github.com/coreos/etcd/pull/9437).
-
-### Go
-
-- Compile with [*Go 1.9.5*](https://golang.org/doc/devel/release.html#go1.9).
-
-
-## [v3.3.2](https://github.com/coreos/etcd/releases/tag/v3.3.2) (2018-03-08)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.3.1...v3.3.2) and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md).**
-
-### etcd server
-
-- Fix [server panic on invalid Election Proclaim/Resign HTTP(S) requests](https://github.com/coreos/etcd/pull/9379).
-  - Previously, wrong-formatted HTTP requests to Election API could trigger panic in etcd server.
-  - e.g. `curl -L http://localhost:2379/v3/election/proclaim -X POST -d '{"value":""}'`, `curl -L http://localhost:2379/v3/election/resign -X POST -d '{"value":""}'`.
-- Fix [revision-based compaction retention parsing](https://github.com/coreos/etcd/pull/9339).
-  - Previously, `etcd --auto-compaction-mode revision --auto-compaction-retention 1` was [translated to revision retention 3600000000000](https://github.com/coreos/etcd/issues/9337).
-  - Now, `etcd --auto-compaction-mode revision --auto-compaction-retention 1` is correctly parsed as revision retention 1.
-- Prevent [overflow by large `TTL` values for `Lease` `Grant`](https://github.com/coreos/etcd/pull/9399).
-  - `TTL` parameter to `Grant` request is unit of second.
-  - Leases with too large `TTL` values exceeding `math.MaxInt64` [expire in unexpected ways](https://github.com/coreos/etcd/issues/9374).
-  - Server now returns `rpctypes.ErrLeaseTTLTooLarge` to client, when the requested `TTL` is larger than *9,000,000,000 seconds* (which is >285 years).
-  - Again, etcd `Lease` is meant for short-periodic keepalives or sessions, in the range of seconds or minutes. Not for hours or days!
-- Enable etcd server [`raft.Config.CheckQuorum` when starting with `ForceNewCluster`](https://github.com/coreos/etcd/pull/9347).
-
-### Proxy v2
-
-- Fix [v2 proxy leaky HTTP requests](https://github.com/coreos/etcd/pull/9336).
-
-### Go
-
-- Compile with [*Go 1.9.4*](https://golang.org/doc/devel/release.html#go1.9).
-
-
-## [v3.3.1](https://github.com/coreos/etcd/releases/tag/v3.3.1) (2018-02-12)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.3.0...v3.3.1) and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md).**
-
-### Improved
-
-- Add [warnings on requests taking too long](https://github.com/coreos/etcd/pull/9288).
-  - e.g. `etcdserver: read-only range request "key:\"\\000\" range_end:\"\\000\" " took too long [3.389041388s] to execute`
-
-### etcd server
-
-- Fix [`mvcc` "unsynced" watcher restore operation](https://github.com/coreos/etcd/pull/9281).
-  - "unsynced" watcher is watcher that needs to be in sync with events that have happened.
-  - That is, "unsynced" watcher is the slow watcher that was requested on old revision.
-  - "unsynced" watcher restore operation was not correctly populating its underlying watcher group.
-  - Which possibly causes [missing events from "unsynced" watchers](https://github.com/coreos/etcd/issues/9086).
-  - A node gets network partitioned with a watcher on a future revision, and falls behind receiving a leader snapshot after partition gets removed. When applying this snapshot, etcd watch storage moves current synced watchers to unsynced since sync watchers might have become stale during network partition. And reset synced watcher group to restart watcher routines. Previously, there was a bug when moving from synced watcher group to unsynced, thus client would miss events when the watcher was requested to the network-partitioned node.
-
-### Go
-
-- Compile with [*Go 1.9.4*](https://golang.org/doc/devel/release.html#go1.9).
-
-
-## [v3.3.0](https://github.com/coreos/etcd/releases/tag/v3.3.0) (2018-02-01)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.2.0...v3.3.0) and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.3 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_3.md).**
-
-- [v3.3.0-rc.4](https://github.com/coreos/etcd/releases/tag/v3.3.0-rc.4) (2018-01-22), see [code changes](https://github.com/coreos/etcd/compare/v3.3.0-rc.3...v3.3.0-rc.4).
-- [v3.3.0-rc.3](https://github.com/coreos/etcd/releases/tag/v3.3.0-rc.3) (2018-01-17), see [code changes](https://github.com/coreos/etcd/compare/v3.3.0-rc.2...v3.3.0-rc.3).
-- [v3.3.0-rc.2](https://github.com/coreos/etcd/releases/tag/v3.3.0-rc.2) (2018-01-11), see [code changes](https://github.com/coreos/etcd/compare/v3.3.0-rc.1...v3.3.0-rc.2).
-- [v3.3.0-rc.1](https://github.com/coreos/etcd/releases/tag/v3.3.0-rc.1) (2018-01-02), see [code changes](https://github.com/coreos/etcd/compare/v3.3.0-rc.0...v3.3.0-rc.1).
-- [v3.3.0-rc.0](https://github.com/coreos/etcd/releases/tag/v3.3.0-rc.0) (2017-12-20), see [code changes](https://github.com/coreos/etcd/compare/v3.2.0...v3.3.0-rc.0).
-
-### Improved
-
-- Use [`coreos/bbolt`](https://github.com/coreos/bbolt/releases) to replace [`boltdb/bolt`](https://github.com/boltdb/bolt#project-status).
-  - Fix [etcd database size grows until `mvcc: database space exceeded`](https://github.com/coreos/etcd/issues/8009).
-- [Support database size larger than 8GiB](https://github.com/coreos/etcd/pull/7525) (8GiB is now a suggested maximum size for normal environments)
-- [Reduce memory allocation](https://github.com/coreos/etcd/pull/8428) on [Range operations](https://github.com/coreos/etcd/pull/8475).
-- [Rate limit](https://github.com/coreos/etcd/pull/8099) and [randomize](https://github.com/coreos/etcd/pull/8101) lease revoke on restart or leader elections.
-  - Prevent [spikes in Raft proposal rate](https://github.com/coreos/etcd/issues/8096).
-- Support `clientv3` balancer failover under [network faults/partitions](https://github.com/coreos/etcd/issues/8711).
-- Better warning on [mismatched `etcd --initial-cluster`](https://github.com/coreos/etcd/pull/8083) flag.
-  - etcd compares `etcd --initial-advertise-peer-urls` against corresponding `etcd --initial-cluster` URLs with forward-lookup.
-  - If resolved IP addresses of `etcd --initial-advertise-peer-urls` and `etcd --initial-cluster` do not match (e.g. [due to DNS error](https://github.com/coreos/etcd/pull/9210)), etcd will exit with errors.
-    - v3.2 error: `etcd --initial-cluster must include s1=https://s1.test:2380 given --initial-advertise-peer-urls=https://s1.test:2380`.
-    - v3.3 error: `failed to resolve https://s1.test:2380 to match --initial-cluster=s1=https://s1.test:2380 (failed to resolve "https://s1.test:2380" (error ...))`.
-
-### Breaking Changes
-
-- Require [`google.golang.org/grpc`](https://github.com/grpc/grpc-go/releases) [**`v1.7.4`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.4) or [**`v1.7.5`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.5).
-  - Deprecate [`metadata.Incoming/OutgoingContext`](https://github.com/coreos/etcd/pull/7896).
-  - Deprecate `grpclog.Logger`, upgrade to [`grpclog.LoggerV2`](https://github.com/coreos/etcd/pull/8533).
-  - Deprecate [`grpc.ErrClientConnTimeout`](https://github.com/coreos/etcd/pull/8505) errors in `clientv3`.
-  - Use [`MaxRecvMsgSize` and `MaxSendMsgSize`](https://github.com/coreos/etcd/pull/8437) to limit message size, in etcd server.
-- Translate [gRPC status error in v3 client `Snapshot` API](https://github.com/coreos/etcd/pull/9038).
-- v3 `etcdctl` [`lease timetolive LEASE_ID`](https://github.com/coreos/etcd/issues/9028) on expired lease now prints [`"lease LEASE_ID already expired"`](https://github.com/coreos/etcd/pull/9047).
-  - <=3.2 prints `"lease LEASE_ID granted with TTL(0s), remaining(-1s)"`.
-- Replace [gRPC gateway](https://github.com/grpc-ecosystem/grpc-gateway) endpoint `/v3alpha` with [`/v3beta`](https://github.com/coreos/etcd/pull/8880).
-  - To deprecate [`/v3alpha`](https://github.com/coreos/etcd/issues/8125) in v3.4.
-  - In v3.3, `curl -L http://localhost:2379/v3alpha/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` still works as a fallback to `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'`, but `curl -L http://localhost:2379/v3alpha/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` won't work in v3.4. Use `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` instead.
-- Change `etcd --auto-compaction-retention` flag to [accept string values](https://github.com/coreos/etcd/pull/8563) with [finer granularity](https://github.com/coreos/etcd/issues/8503).
-  - Now that `etcd --auto-compaction-retention` accepts string values, etcd configuration YAML file `auto-compaction-retention` field must be changed to `string` type.
-  - Previously, `--config-file etcd.config.yaml` can have `auto-compaction-retention: 24` field, now must be `auto-compaction-retention: "24"` or `auto-compaction-retention: "24h"`.
-  - If configured as `etcd --auto-compaction-mode periodic --auto-compaction-retention "24h"`, the time duration value for `etcd --auto-compaction-retention` flag must be valid for [`time.ParseDuration`](https://golang.org/pkg/time/#ParseDuration) function in Go.
-
-### Dependency
-
-- Upgrade [`boltdb/bolt`](https://github.com/boltdb/bolt#project-status) from [**`v1.3.0`**](https://github.com/boltdb/bolt/releases/tag/v1.3.0) to [`coreos/bbolt`](https://github.com/coreos/bbolt/releases) [**`v1.3.1-coreos.6`**](https://github.com/coreos/bbolt/releases/tag/v1.3.1-coreos.6).
-- Upgrade [`google.golang.org/grpc`](https://github.com/grpc/grpc-go/releases) from [**`v1.2.1`**](https://github.com/grpc/grpc-go/releases/tag/v1.2.1) to [**`v1.7.5`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.5).
-- Upgrade [`github.com/ugorji/go/codec`](https://github.com/ugorji/go) to [**`v1.1`**](https://github.com/ugorji/go/releases/tag/v1.1), and [regenerate v2 `client`](https://github.com/coreos/etcd/pull/8721).
-- Upgrade [`github.com/ugorji/go/codec`](https://github.com/ugorji/go) to [**`ugorji/go@54210f4e0`**](https://github.com/ugorji/go/commit/54210f4e076c57f351166f0ed60e67d3fca57a36), and [regenerate v2 `client`](https://github.com/coreos/etcd/pull/8574).
-- Upgrade [`github.com/grpc-ecosystem/grpc-gateway`](https://github.com/grpc-ecosystem/grpc-gateway/releases) from [**`v1.2.2`**](https://github.com/grpc-ecosystem/grpc-gateway/releases/tag/v1.2.2) to [**`v1.3.0`**](https://github.com/grpc-ecosystem/grpc-gateway/releases/tag/v1.3.0).
-- Upgrade [`golang.org/x/crypto/bcrypt`](https://github.com/golang/crypto) to [**`golang/crypto@6c586e17d`**](https://github.com/golang/crypto/commit/6c586e17d90a7d08bbbc4069984180dce3b04117).
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#v3-3) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd --listen-metrics-urls`](https://github.com/coreos/etcd/pull/8242) flag for additional `/metrics` and `/health` endpoints.
-  - Useful for [bypassing critical APIs when monitoring etcd](https://github.com/coreos/etcd/issues/8060).
-- Add [`etcd_server_version`](https://github.com/coreos/etcd/pull/8960) Prometheus metric.
-  - To replace [Kubernetes `etcd-version-monitor`](https://github.com/coreos/etcd/issues/8948).
-- Add [`etcd_debugging_mvcc_db_compaction_keys_total`](https://github.com/coreos/etcd/pull/8280) Prometheus metric.
-- Add [`etcd_debugging_server_lease_expired_total`](https://github.com/coreos/etcd/pull/8064) Prometheus metric.
-  - To improve [lease revoke monitoring](https://github.com/coreos/etcd/issues/8050).
-- Document [Prometheus 2.0 rules](https://github.com/coreos/etcd/pull/8879).
-- Initialize gRPC server [metrics with zero values](https://github.com/coreos/etcd/pull/8878).
-- Fix [range/put/delete operation metrics](https://github.com/coreos/etcd/pull/8054) with transaction.
-  - `etcd_debugging_mvcc_range_total`
-  - `etcd_debugging_mvcc_put_total`
-  - `etcd_debugging_mvcc_delete_total`
-  - `etcd_debugging_mvcc_txn_total`
-- Fix [`etcd_debugging_mvcc_keys_total`](https://github.com/coreos/etcd/pull/8390) on restore.
-- Fix [`etcd_debugging_mvcc_db_total_size_in_bytes`](https://github.com/coreos/etcd/pull/8120) on restore.
-  - Also change to [`prometheus.NewGaugeFunc`](https://github.com/coreos/etcd/pull/8150).
-
-### Security, Authentication
-
-See [security doc](https://github.com/coreos/etcd/blob/master/Documentation/op-guide/security.md) for more details.
-
-- Add [CRL based connection rejection](https://github.com/coreos/etcd/pull/8124) to manage [revoked certs](https://github.com/coreos/etcd/issues/4034).
-- Document [TLS authentication changes](https://github.com/coreos/etcd/pull/8895).
-  - [Server accepts connections if IP matches, without checking DNS entries](https://github.com/coreos/etcd/pull/8223). For instance, if peer cert contains IP addresses and DNS names in Subject Alternative Name (SAN) field, and the remote IP address matches one of those IP addresses, server just accepts connection without further checking the DNS names.
-  - [Server supports reverse-lookup on wildcard DNS `SAN`](https://github.com/coreos/etcd/pull/8281). For instance, if peer cert contains only DNS names (no IP addresses) in Subject Alternative Name (SAN) field, server first reverse-lookups the remote IP address to get a list of names mapping to that address (e.g. `nslookup IPADDR`). Then accepts the connection if those names have a matching name with peer cert's DNS names (either by exact or wildcard match). If none is matched, server forward-lookups each DNS entry in peer cert (e.g. look up `example.default.svc` when the entry is `*.example.default.svc`), and accepts connection only when the host's resolved addresses have the matching IP address with the peer's remote IP address.
-- Add [`etcd --peer-cert-allowed-cn`](https://github.com/coreos/etcd/pull/8616) flag.
-  - To support [CommonName(CN) based auth](https://github.com/coreos/etcd/issues/8262) for inter peer connection.
-- [Swap priority](https://github.com/coreos/etcd/pull/8594) of cert CommonName(CN) and username + password.
-  - To address ["username and password specified in the request should take priority over CN in the cert"](https://github.com/coreos/etcd/issues/8584).
-- Protect [lease revoke with auth](https://github.com/coreos/etcd/pull/8031).
-- Provide user's role on [auth permission error](https://github.com/coreos/etcd/pull/8164).
-- Fix [auth store panic with disabled token](https://github.com/coreos/etcd/pull/8695).
-
-### etcd server
-
-- Add [`etcd --experimental-initial-corrupt-check`](https://github.com/coreos/etcd/pull/8554) flag to [check cluster database hashes before serving client/peer traffic](https://github.com/coreos/etcd/issues/8313).
-  - `etcd --experimental-initial-corrupt-check=false` by default.
-  - v3.4 will enable `--initial-corrupt-check=true` by default.
-- Add [`etcd --experimental-corrupt-check-time`](https://github.com/coreos/etcd/pull/8420) flag to [raise corrupt alarm monitoring](https://github.com/coreos/etcd/issues/7125).
-  - `etcd --experimental-corrupt-check-time=0s` disabled by default.
-- Add [`etcd --experimental-enable-v2v3`](https://github.com/coreos/etcd/pull/8407) flag to [emulate v2 API with v3](https://github.com/coreos/etcd/issues/6925).
-  - `etcd --experimental-enable-v2v3=false` by default.
-- Add [`etcd --max-txn-ops`](https://github.com/coreos/etcd/pull/7976) flag to [configure maximum number operations in transaction](https://github.com/coreos/etcd/issues/7826).
-- Add [`etcd --max-request-bytes`](https://github.com/coreos/etcd/pull/7968) flag to [configure maximum client request size](https://github.com/coreos/etcd/issues/7923).
-  - If not configured, it defaults to 1.5 MiB.
-- Add [`etcd --client-crl-file`, `--peer-crl-file`](https://github.com/coreos/etcd/pull/8124) flags for [Certificate revocation list](https://github.com/coreos/etcd/issues/4034).
-- Add [`etcd --peer-cert-allowed-cn`](https://github.com/coreos/etcd/pull/8616) flag to support [CN-based auth for inter-peer connection](https://github.com/coreos/etcd/issues/8262).
-- Add [`etcd --listen-metrics-urls`](https://github.com/coreos/etcd/pull/8242) flag for additional `/metrics` and `/health` endpoints.
-  - Support [additional (non) TLS `/metrics` endpoints for a TLS-enabled cluster](https://github.com/coreos/etcd/pull/8282).
-  - e.g. `etcd --listen-metrics-urls=https://localhost:2378,http://localhost:9379` to serve `/metrics` and `/health` on secure port 2378 and insecure port 9379.
-  - Useful for [bypassing critical APIs when monitoring etcd](https://github.com/coreos/etcd/issues/8060).
-- Add [`etcd --auto-compaction-mode`](https://github.com/coreos/etcd/pull/8123) flag to [support revision-based compaction](https://github.com/coreos/etcd/issues/8098).
-- Change `etcd --auto-compaction-retention` flag to [accept string values](https://github.com/coreos/etcd/pull/8563) with [finer granularity](https://github.com/coreos/etcd/issues/8503).
-  - Now that `etcd --auto-compaction-retention` accepts string values, etcd configuration YAML file `auto-compaction-retention` field must be changed to `string` type.
-  - Previously, `etcd --config-file etcd.config.yaml` can have `auto-compaction-retention: 24` field, now must be `auto-compaction-retention: "24"` or `auto-compaction-retention: "24h"`.
-  - If configured as `--auto-compaction-mode periodic --auto-compaction-retention "24h"`, the time duration value for `etcd --auto-compaction-retention` flag must be valid for [`time.ParseDuration`](https://golang.org/pkg/time/#ParseDuration) function in Go.
-  - e.g. `etcd --auto-compaction-mode=revision --auto-compaction-retention=1000` automatically `Compact` on `"latest revision" - 1000` every 5-minute (when latest revision is 30000, compact on revision 29000).
-  - e.g. `etcd --auto-compaction-mode=periodic --auto-compaction-retention=72h` automatically `Compact` with 72-hour retention windown, for every 7.2-hour.
-  - e.g. `etcd --auto-compaction-mode=periodic --auto-compaction-retention=30m` automatically `Compact` with 30-minute retention windown, for every 3-minute.
-  - Periodic compactor continues to record latest revisions for every 1/10 of given compaction period (e.g. 1-hour when `etcd --auto-compaction-mode=periodic --auto-compaction-retention=10h`).
-  - For every 1/10 of given compaction period, compactor uses the last revision that was fetched before compaction period, to discard historical data.
-  - The retention window of compaction period moves for every 1/10 of given compaction period.
-  - For instance, when hourly writes are 100 and `--auto-compaction-retention=10`, v3.1 compacts revision 1000, 2000, and 3000 for every 10-hour, while v3.2.x, v3.3.0, v3.3.1, and v3.3.2 compact revision 1000, 1100, and 1200 for every 1-hour. Futhermore, when writes per minute are 1000, v3.3.0, v3.3.1, and v3.3.2 with `--auto-compaction-mode=periodic --auto-compaction-retention=30m` compact revision 30000, 33000, and 36000, for every 3-minute with more finer granularity.
-  - Whether compaction succeeds or not, this process repeats for every 1/10 of given compaction period. If compaction succeeds, it just removes compacted revision from historical revision records.
-- Add [`etcd --grpc-keepalive-min-time`, `etcd --grpc-keepalive-interval`, `etcd --grpc-keepalive-timeout`](https://github.com/coreos/etcd/pull/8535) flags to configure server-side keepalive policies.
-- Serve [`/health` endpoint as unhealthy](https://github.com/coreos/etcd/pull/8272) when [alarm (e.g. `NOSPACE`) is raised or there's no leader](https://github.com/coreos/etcd/issues/8207).
-  - Define [`etcdhttp.Health`](https://godoc.org/github.com/coreos/etcd/etcdserver/api/etcdhttp#Health) struct with JSON encoder.
-  - Note that `"health"` field is [`string` type, not `bool`](https://github.com/coreos/etcd/pull/9143).
-    - e.g. `{"health":"false"}`, `{"health":"true"}`
-  - [Remove `"errors"` field](https://github.com/coreos/etcd/pull/9162) since `v3.3.0-rc.3` (did exist only in `v3.3.0-rc.0`, `v3.3.0-rc.1`, `v3.3.0-rc.2`).
-- Move [logging setup to embed package](https://github.com/coreos/etcd/pull/8810)
-  - Disable gRPC server info-level logs by default (can be enabled with `etcd --debug` flag).
-- Use [monotonic time in Go 1.9](https://github.com/coreos/etcd/pull/8507) for `lease` package.
-- Warn on [empty hosts in advertise URLs](https://github.com/coreos/etcd/pull/8384).
-  - Address [advertise client URLs accepts empty hosts](https://github.com/coreos/etcd/issues/8379).
-  - etcd v3.4 will exit on this error.
-    - e.g. `etcd --advertise-client-urls=http://:2379`.
-- Warn on [shadowed environment variables](https://github.com/coreos/etcd/pull/8385).
-  - Address [error on shadowed environment variables](https://github.com/coreos/etcd/issues/8380).
-  - etcd v3.4 will exit on this error.
-
-### API
-
-- Support [ranges in transaction comparisons](https://github.com/coreos/etcd/pull/8025) for [disconnected linearized reads](https://github.com/coreos/etcd/issues/7924).
-- Add [nested transactions](https://github.com/coreos/etcd/pull/8102) to extend [proxy use cases](https://github.com/coreos/etcd/issues/7857).
-- Add [lease comparison target in transaction](https://github.com/coreos/etcd/pull/8324).
-- Add [lease list](https://github.com/coreos/etcd/pull/8358).
-- Add [hash by revision](https://github.com/coreos/etcd/pull/8263) for [better corruption checking against boltdb](https://github.com/coreos/etcd/issues/8016).
-
-### client v3
-
-- Add [health balancer](https://github.com/coreos/etcd/pull/8545) to fix [watch API hangs](https://github.com/coreos/etcd/issues/7247), improve [endpoint switch under network faults](https://github.com/coreos/etcd/issues/7941).
-- [Refactor balancer](https://github.com/coreos/etcd/pull/8840) and add [client-side keepalive pings](https://github.com/coreos/etcd/pull/8199) to handle [network partitions](https://github.com/coreos/etcd/issues/8711).
-- Add [`MaxCallSendMsgSize` and `MaxCallRecvMsgSize`](https://github.com/coreos/etcd/pull/9047) fields to [`clientv3.Config`](https://godoc.org/github.com/coreos/etcd/clientv3#Config).
-  - Fix [exceeded response size limit error in client-side](https://github.com/coreos/etcd/issues/9043).
-  - Address [kubernetes#51099](https://github.com/kubernetes/kubernetes/issues/51099).
-    - In previous versions(v3.2.10, v3.2.11), client response size was limited to only 4 MiB.
-  - `MaxCallSendMsgSize` default value is 2 MiB, if not configured.
-  - `MaxCallRecvMsgSize` default value is `math.MaxInt32`, if not configured.
-- Accept [`Compare_LEASE`](https://github.com/coreos/etcd/pull/8324) in [`clientv3.Compare`](https://godoc.org/github.com/coreos/etcd/clientv3#Compare).
-- Add [`LeaseValue` helper](https://github.com/coreos/etcd/pull/8488) to `Cmp` `LeaseID` values in `Txn`.
-- Add [`MoveLeader`](https://github.com/coreos/etcd/pull/8153) to `Maintenance`.
-- Add [`HashKV`](https://github.com/coreos/etcd/pull/8351) to `Maintenance`.
-- Add [`Leases`](https://github.com/coreos/etcd/pull/8358) to `Lease`.
-- Add [`clientv3/ordering`](https://github.com/coreos/etcd/pull/8092) for enforce [ordering in serialized requests](https://github.com/coreos/etcd/issues/7623).
-- Fix ["put at-most-once" violation](https://github.com/coreos/etcd/pull/8335).
-- Fix [`WatchResponse.Canceled`](https://github.com/coreos/etcd/pull/8283) on [compacted watch request](https://github.com/coreos/etcd/issues/8231).
-- Fix [`concurrency/stm` `Put` with serializable snapshot](https://github.com/coreos/etcd/pull/8439).
-  - Use store revision from first fetch to resolve write conflicts instead of modified revision.
-
-### etcdctl v3
-
-- Add [`etcdctl --discovery-srv`](https://github.com/coreos/etcd/pull/8462) flag.
-- Add [`etcdctl --keepalive-time`, `--keepalive-timeout`](https://github.com/coreos/etcd/pull/8663) flags.
-- Add [`etcdctl lease list`](https://github.com/coreos/etcd/pull/8358) command.
-- Add [`etcdctl lease keep-alive --once`](https://github.com/coreos/etcd/pull/8775) flag.
-- Make [`lease timetolive LEASE_ID`](https://github.com/coreos/etcd/issues/9028) on expired lease print [`lease LEASE_ID already expired`](https://github.com/coreos/etcd/pull/9047).
-  - <=3.2 prints `lease LEASE_ID granted with TTL(0s), remaining(-1s)`.
-- Add [`etcdctl snapshot restore --wal-dir`](https://github.com/coreos/etcd/pull/9124) flag.
-- Add [`etcdctl defrag --data-dir`](https://github.com/coreos/etcd/pull/8367) flag.
-- Add [`etcdctl move-leader`](https://github.com/coreos/etcd/pull/8153) command.
-- Add [`etcdctl endpoint hashkv`](https://github.com/coreos/etcd/pull/8351) command.
-- Add [`etcdctl endpoint --cluster`](https://github.com/coreos/etcd/pull/8143) flag, equivalent to [v2 `etcdctl cluster-health`](https://github.com/coreos/etcd/issues/8117).
-- Make `etcdctl endpoint health` command terminate with [non-zero exit code on unhealthy status](https://github.com/coreos/etcd/pull/8342).
-- Add [`etcdctl lock --ttl`](https://github.com/coreos/etcd/pull/8370) flag.
-- Support [`etcdctl watch [key] [range_end] -- [exec-command…]`](https://github.com/coreos/etcd/pull/8919), equivalent to [v2 `etcdctl exec-watch`](https://github.com/coreos/etcd/issues/8814).
-  - Make `etcdctl watch -- [exec-command]` set environmental variables [`ETCD_WATCH_REVISION`, `ETCD_WATCH_EVENT_TYPE`, `ETCD_WATCH_KEY`, `ETCD_WATCH_VALUE`](https://github.com/coreos/etcd/pull/9142) for each event.
-- Support [`etcdctl watch` with environmental variables `ETCDCTL_WATCH_KEY` and `ETCDCTL_WATCH_RANGE_END`](https://github.com/coreos/etcd/pull/9142).
-- Enable [`clientv3.WithRequireLeader(context.Context)` for `watch`](https://github.com/coreos/etcd/pull/8672) command.
-- Print [`"del"` instead of `"delete"`](https://github.com/coreos/etcd/pull/8297) in `txn` interactive mode.
-- Print [`ETCD_INITIAL_ADVERTISE_PEER_URLS` in `member add`](https://github.com/coreos/etcd/pull/8332).
-
-### etcdctl v3
-
-- Handle [empty key permission](https://github.com/coreos/etcd/pull/8514) in `etcdctl`.
-
-### etcdctl v2
-
-- Add [`etcdctl backup --with-v3`](https://github.com/coreos/etcd/pull/8479) flag.
-
-### gRPC Proxy
-
-- Add [`grpc-proxy start --experimental-leasing-prefix`](https://github.com/coreos/etcd/pull/8341) flag.
-  - For disconnected linearized reads.
-  - Based on [V system leasing](https://github.com/coreos/etcd/issues/6065).
-  - See ["Disconnected consistent reads with etcd" blog post](https://coreos.com/blog/coreos-labs-disconnected-consistent-reads-with-etcd).
-- Add [`grpc-proxy start --experimental-serializable-ordering`](https://github.com/coreos/etcd/pull/8315) flag.
-  - To ensure serializable reads have monotonically increasing store revisions across endpoints.
-- Add [`grpc-proxy start --metrics-addr`](https://github.com/coreos/etcd/pull/8242) flag for an additional `/metrics` endpoint.
-  - Set `--metrics-addr=http://[HOST]:9379` to serve `/metrics` in insecure port 9379.
-- Serve [`/health` endpoint in grpc-proxy](https://github.com/coreos/etcd/pull/8322).
-- Add [`grpc-proxy start --debug`](https://github.com/coreos/etcd/pull/8994) flag.
-- Add [`grpc-proxy start --max-send-bytes`](https://github.com/coreos/etcd/pull/9250) flag to [configure maximum client request size](https://github.com/coreos/etcd/issues/7923).
-- Add [`grpc-proxy start --max-recv-bytes`](https://github.com/coreos/etcd/pull/9250) flag to [configure maximum client request size](https://github.com/coreos/etcd/issues/7923).
-- Fix [Snapshot API error handling](https://github.com/coreos/etcd/commit/dbd16d52fbf81e5fd806d21ff5e9148d5bf203ab).
-- Fix [KV API `PrevKv` flag handling](https://github.com/coreos/etcd/pull/8366).
-- Fix [KV API `KeysOnly` flag handling](https://github.com/coreos/etcd/pull/8552).
-
-### gRPC gateway
-
-- Replace [gRPC gateway](https://github.com/grpc-ecosystem/grpc-gateway) endpoint `/v3alpha` with [`/v3beta`](https://github.com/coreos/etcd/pull/8880).
-  - To deprecate [`/v3alpha`](https://github.com/coreos/etcd/issues/8125) in v3.4.
-  - In v3.3, `curl -L http://localhost:2379/v3alpha/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` still works as a fallback to `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'`, but `curl -L http://localhost:2379/v3alpha/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` won't work in v3.4. Use `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` instead.
-- Support ["authorization" token](https://github.com/coreos/etcd/pull/7999).
-- Support [websocket for bi-directional streams](https://github.com/coreos/etcd/pull/8257).
-  - Fix [`Watch` API with gRPC gateway](https://github.com/coreos/etcd/issues/8237).
-- Upgrade gRPC gateway to [v1.3.0](https://github.com/coreos/etcd/issues/8838).
-
-### etcd server
-
-- Fix [backend database in-memory index corruption](https://github.com/coreos/etcd/pull/8127) issue on restore (only 3.2.0 is affected).
-- Fix [watch restore from snapshot](https://github.com/coreos/etcd/pull/8427).
-- Fix [`mvcc/backend.defragdb` nil-pointer dereference on create bucket failure](https://github.com/coreos/etcd/pull/9119).
-- Fix [server crash](https://github.com/coreos/etcd/pull/8010) on [invalid transaction request from gRPC gateway](https://github.com/coreos/etcd/issues/7889).
-- Prevent [server panic from member update/add](https://github.com/coreos/etcd/pull/9174) with [wrong scheme URLs](https://github.com/coreos/etcd/issues/9173).
-- Make [peer dial timeout longer](https://github.com/coreos/etcd/pull/8599).
-  - See [coreos/etcd-operator#1300](https://github.com/coreos/etcd-operator/issues/1300) for more detail.
-- Make server [wait up to request time-out](https://github.com/coreos/etcd/pull/8267) with [pending RPCs](https://github.com/coreos/etcd/issues/8224).
-- Fix [`grpc.Server` panic on `GracefulStop`](https://github.com/coreos/etcd/pull/8987) with [TLS-enabled server](https://github.com/coreos/etcd/issues/8916).
-- Fix ["multiple peer URLs cannot start" issue](https://github.com/coreos/etcd/issues/8383).
-- Fix server-side auth so [concurrent auth operations do not return old revision error](https://github.com/coreos/etcd/pull/8442).
-- Handle [WAL renaming failure on Windows](https://github.com/coreos/etcd/pull/8286).
-- Upgrade [`coreos/go-systemd`](https://github.com/coreos/go-systemd/releases) to `v15` (see https://github.com/coreos/go-systemd/releases/tag/v15).
-- [Put back `/v2/machines`](https://github.com/coreos/etcd/pull/8062) endpoint for python-etcd wrapper.
-
-### client v2
-
-- [Fail-over v2 client](https://github.com/coreos/etcd/pull/8519) to next endpoint on [oneshot failure](https://github.com/coreos/etcd/issues/8515).
-
-### Package `raft`
-
-- Add [non-voting member](https://github.com/coreos/etcd/pull/8751).
-  - To implement [Raft thesis 4.2.1 Catching up new servers](https://github.com/coreos/etcd/issues/8568).
-  - `Learner` node does not vote or promote itself.
-
-### Other
-
-- Support previous two minor versions (see our [new release policy](https://github.com/coreos/etcd/pull/8805)).
-- `v3.3.x` is the last release cycle that supports `ACI`.
-  - [AppC was officially suspended](https://github.com/appc/spec#-disclaimer-), as of late 2016.
-  - [`acbuild`](https://github.com/containers/build#this-project-is-currently-unmaintained) is not maintained anymore.
-  - `*.aci` files won't be available from etcd v3.4 release.
-- Add container registry [`gcr.io/etcd-development/etcd`](https://gcr.io/etcd-development/etcd).
-  - [quay.io/coreos/etcd](https://quay.io/coreos/etcd) is still supported as secondary.
-
-### Go
-
-- Require [*Go 1.9+*](https://github.com/coreos/etcd/issues/6174).
-- Compile with [*Go 1.9.3*](https://golang.org/doc/devel/release.html#go1.9).
-- Deprecate [`golang.org/x/net/context`](https://github.com/coreos/etcd/pull/8511).
-

CHANGELOG-3.4.md

@@ -1,424 +0,0 @@
-
-
-Previous change logs can be found at [CHANGELOG-3.3](https://github.com/coreos/etcd/blob/master/CHANGELOG-3.3.md).
-
-
-## v3.4.0 (TBD 2018-09)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.3.0...v3.4.0) and [v3.4 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_4.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.4 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_4.md).**
-
-### Improved
-
-- Rewrite [client balancer](https://github.com/coreos/etcd/pull/9860) with [new gRPC balancer interface](https://github.com/coreos/etcd/issues/9106).
-- Add [backoff on watch retries on transient errors](https://github.com/coreos/etcd/pull/9840).
-- Add [jitter to watch progress notify](https://github.com/coreos/etcd/pull/9278) to prevent [spikes in `etcd_network_client_grpc_sent_bytes_total`](https://github.com/coreos/etcd/issues/9246).
-- Improve [slow request apply warning log](https://github.com/coreos/etcd/pull/9288).
-  - e.g. `read-only range request "key:\"/a\" range_end:\"/b\" " with result "range_response_count:3 size:96" took too long (97.966µs) to execute`.
-  - Redact [request value field](https://github.com/coreos/etcd/pull/9822).
-  - Provide [response size](https://github.com/coreos/etcd/pull/9826).
-- Improve [TLS setup error logging](https://github.com/coreos/etcd/pull/9518) to help debug [TLS-enabled cluster configuring issues](https://github.com/coreos/etcd/issues/9400).
-- Improve [long-running concurrent read transactions under light write workloads](https://github.com/coreos/etcd/pull/9296).
-  - Previously, periodic commit on pending writes blocks incoming read transactions, even if there is no pending write.
-  - Now, periodic commit operation does not block concurrent read transactions, thus improves long-running read transaction performance.
-- Improve [Raft Read Index timeout warning messages](https://github.com/coreos/etcd/pull/9897).
-- Adjust [election timeout on server restart](https://github.com/coreos/etcd/pull/9415) to reduce [disruptive rejoining servers](https://github.com/coreos/etcd/issues/9333).
-  - Previously, etcd fast-forwards election ticks on server start, with only one tick left for leader election. This is to speed up start phase, without having to wait until all election ticks elapse. Advancing election ticks is useful for cross datacenter deployments with larger election timeouts. However, it was affecting cluster availability if the last tick elapses before leader contacts the restarted node.
-  - Now, when etcd restarts, it adjusts election ticks with more than one tick left, thus more time for leader to prevent disruptive restart.
-- Add [Raft Pre-Vote feature](https://github.com/coreos/etcd/pull/9352) to reduce [disruptive rejoining servers](https://github.com/coreos/etcd/issues/9333).
-  - For instance, a flaky(or rejoining) member may drop in and out, and start campaign. This member will end up with a higher term, and ignore all incoming messages with lower term. In this case, a new leader eventually need to get elected, thus disruptive to cluster availability. Raft implements Pre-Vote phase to prevent this kind of disruptions. If enabled, Raft runs an additional phase of election to check if pre-candidate can get enough votes to win an election.
-- Adjust [periodic compaction retention window](https://github.com/coreos/etcd/pull/9485).
-  - e.g. `etcd --auto-compaction-mode=revision --auto-compaction-retention=1000` automatically `Compact` on `"latest revision" - 1000` every 5-minute (when latest revision is 30000, compact on revision 29000).
-  - e.g. Previously, `etcd --auto-compaction-mode=periodic --auto-compaction-retention=24h` automatically `Compact` with 24-hour retention windown for every 2.4-hour. Now, `Compact` happens for every 1-hour.
-  - e.g. Previously, `etcd --auto-compaction-mode=periodic --auto-compaction-retention=30m` automatically `Compact` with 30-minute retention windown for every 3-minute. Now, `Compact` happens for every 30-minute.
-  - Periodic compactor keeps recording latest revisions for every compaction period when given period is less than 1-hour, or for every 1-hour when given compaction period is greater than 1-hour (e.g. 1-hour when `etcd --auto-compaction-mode=periodic --auto-compaction-retention=24h`).
-  - For every compaction period or 1-hour, compactor uses the last revision that was fetched before compaction period, to discard historical data.
-  - The retention window of compaction period moves for every given compaction period or hour.
-  - For instance, when hourly writes are 100 and `etcd --auto-compaction-mode=periodic --auto-compaction-retention=24h`, `v3.2.x`, `v3.3.0`, `v3.3.1`, and `v3.3.2` compact revision 2400, 2640, and 2880 for every 2.4-hour, while `v3.3.3` *or later* compacts revision 2400, 2500, 2600 for every 1-hour.
-  - Futhermore, when `etcd --auto-compaction-mode=periodic --auto-compaction-retention=30m` and writes per minute are about 1000, `v3.3.0`, `v3.3.1`, and `v3.3.2` compact revision 30000, 33000, and 36000, for every 3-minute, while `v3.3.3` *or later* compacts revision 30000, 60000, and 90000, for every 30-minute.
-- Improve [lease expire/revoke operation performance](https://github.com/coreos/etcd/pull/9418), address [lease scalability issue](https://github.com/coreos/etcd/issues/9496).
-- Make [Lease `Lookup` non-blocking with concurrent `Grant`/`Revoke`](https://github.com/coreos/etcd/pull/9229).
-- Make etcd server return `raft.ErrProposalDropped` on internal Raft proposal drop in [v3 applier](https://github.com/coreos/etcd/pull/9549) and [v2 applier](https://github.com/coreos/etcd/pull/9558).
-  - e.g. a node is removed from cluster, or [`raftpb.MsgProp` arrives at current leader while there is an ongoing leadership transfer](https://github.com/coreos/etcd/issues/8975).
-- Add [`snapshot`](https://github.com/coreos/etcd/pull/9118) package for easier snapshot workflow (see [`godoc.org/github.com/etcd/clientv3/snapshot`](https://godoc.org/github.com/coreos/etcd/clientv3/snapshot) for more).
-- Improve [functional tester](https://github.com/coreos/etcd/tree/master/functional) coverage: [proxy layer to run network fault tests in CI](https://github.com/coreos/etcd/pull/9081), [TLS is enabled both for server and client](https://github.com/coreos/etcd/pull/9534), [liveness mode](https://github.com/coreos/etcd/issues/9230), [shuffle test sequence](https://github.com/coreos/etcd/issues/9381), [membership reconfiguration failure cases](https://github.com/coreos/etcd/pull/9564), [disastrous quorum loss and snapshot recover from a seed member](https://github.com/coreos/etcd/pull/9565), [embedded etcd](https://github.com/coreos/etcd/pull/9572).
-- Improve [index compaction blocking](https://github.com/coreos/etcd/pull/9511) by using a copy on write clone to avoid holding the lock for the traversal of the entire index.
-- Update [JWT methods](https://github.com/coreos/etcd/pull/9883) to allow for use of any supported signature method/algorithm.
-- Add [Lease checkpointing](https://github.com/coreos/etcd/pull/9924) to persist remaining TTLs to the consensus log periodically so that long lived leases progress toward expiry in the presence of leader elections and server restarts.
-
-### Breaking Changes
-
-- Make [`ETCDCTL_API=3 etcdctl` default](https://github.com/coreos/etcd/issues/9600).
-  - Now, `etcdctl set foo bar` must be `ETCDCTL_API=2 etcdctl set foo bar`.
-  - Now, `ETCDCTL_API=3 etcdctl put foo bar` could be just `etcdctl put foo bar`.
-- **Remove `etcd --ca-file` flag**, instead [use `etcd --trusted-ca-file`](https://github.com/coreos/etcd/pull/9470) (`etcd --ca-file` flag has been marked deprecated since v2.1).
-- **Remove `etcd --peer-ca-file` flag**, instead [use `etcd --peer-trusted-ca-file`](https://github.com/coreos/etcd/pull/9470) (`etcd --peer-ca-file` flag has been marked deprecated since v2.1).
-- **Remove `pkg/transport.TLSInfo.CAFile` field**, instead [use `pkg/transport.TLSInfo.TrustedCAFile`](https://github.com/coreos/etcd/pull/9470) (`CAFile` field has been marked deprecated since v2.1).
-- Deprecate `latest` [release container](https://console.cloud.google.com/gcr/images/etcd-development/GLOBAL/etcd) tag.
-  - **`docker pull gcr.io/etcd-development/etcd:latest` would not be up-to-date**.
-- Deprecate [minor](https://semver.org/) version [release container](https://console.cloud.google.com/gcr/images/etcd-development/GLOBAL/etcd) tags.
-  - `docker pull gcr.io/etcd-development/etcd:v3.3` would still work.
-  - **`docker pull gcr.io/etcd-development/etcd:v3.4` would not work**.
-  - Use **`docker pull gcr.io/etcd-development/etcd:v3.4.x`** instead, with the exact patch version.
-- Drop [ACIs from official release](https://github.com/coreos/etcd/pull/9059).
-  - [AppC was officially suspended](https://github.com/appc/spec#-disclaimer-), as of late 2016.
-  - [`acbuild`](https://github.com/containers/build#this-project-is-currently-unmaintained) is not maintained anymore.
-  - `*.aci` files are not available from `v3.4` release.
-- Exit on [empty hosts in advertise URLs](https://github.com/coreos/etcd/pull/8786).
-  - Address [advertise client URLs accepts empty hosts](https://github.com/coreos/etcd/issues/8379).
-  - e.g. exit with error on `--advertise-client-urls=http://:2379`.
-  - e.g. exit with error on `--initial-advertise-peer-urls=http://:2380`.
-- Exit on [shadowed environment variables](https://github.com/coreos/etcd/pull/9382).
-  - Address [error on shadowed environment variables](https://github.com/coreos/etcd/issues/8380).
-  - e.g. exit with error on `ETCD_NAME=abc etcd --name=def`.
-  - e.g. exit with error on `ETCD_INITIAL_CLUSTER_TOKEN=abc etcd --initial-cluster-token=def`.
-  - e.g. exit with error on `ETCDCTL_ENDPOINTS=abc.com ETCDCTL_API=3 etcdctl endpoint health --endpoints=def.com`.
-- Change [`etcdserverpb.AuthRoleRevokePermissionRequest/key,range_end` fields type from `string` to `bytes`](https://github.com/coreos/etcd/pull/9433).
-- Rename [`etcd_debugging_mvcc_db_total_size_in_bytes` Prometheus metric to `etcd_mvcc_db_total_size_in_bytes`](https://github.com/coreos/etcd/pull/9819).
-- Rename `etcdserver.ServerConfig.SnapCount` field to `etcdserver.ServerConfig.SnapshotCount`, to be consistent with the flag name `etcd --snapshot-count`.
-- Rename `embed.Config.SnapCount` field to [`embed.Config.SnapshotCount`](https://github.com/coreos/etcd/pull/9745), to be consistent with the flag name `etcd --snapshot-count`.
-- Change [`embed.Config.CorsInfo` in `*cors.CORSInfo` type to `embed.Config.CORS` in `map[string]struct{}` type](https://github.com/coreos/etcd/pull/9490).
-- Remove [`embed.Config.SetupLogging`](https://github.com/coreos/etcd/pull/9572).
-  - Now logger is set up automatically based on [`embed.Config.Logger`, `embed.Config.LogOutputs`, `embed.Config.Debug` fields](https://github.com/coreos/etcd/pull/9572).
-- Rename [`etcd --log-output` to `etcd --log-outputs`](https://github.com/coreos/etcd/pull/9624) to support multiple log outputs.
-  - **`etcd --log-output`** will be deprecated in v3.5.
-- Rename [**`embed.Config.LogOutput`** to **`embed.Config.LogOutputs`**](https://github.com/coreos/etcd/pull/9624) to support multiple log outputs.
-- Change [**`embed.Config.LogOutputs`** type from `string` to `[]string`](https://github.com/coreos/etcd/pull/9579) to support multiple log outputs.
-  - Now that `etcd --log-outputs` accepts multiple writers, etcd configuration YAML file `log-outputs` field must be changed to `[]string` type.
-  - Previously, `etcd --config-file etcd.config.yaml` can have `log-outputs: default` field, now must be `log-outputs: [default]`.
-- Change v3 `etcdctl snapshot` exit codes with [`snapshot` package](https://github.com/coreos/etcd/pull/9118/commits/df689f4280e1cce4b9d61300be13ca604d41670a).
-  - Exit on error with exit code 1 (no more exit code 5 or 6 on `snapshot save/restore` commands).
-- Migrate dependency management tool from `glide` to [`golang/dep`](https://github.com/coreos/etcd/pull/9155).
-  - <= 3.3 puts `vendor` directory under `cmd/vendor` directory to [prevent conflicting transitive dependencies](https://github.com/coreos/etcd/issues/4913).
-  - 3.4 moves `cmd/vendor` directory to `vendor` at repository root.
-  - Remove recursive symlinks in `cmd` directory.
-  - Now `go get/install/build` on `etcd` packages (e.g. `clientv3`, `tools/benchmark`) enforce builds with etcd `vendor` directory.
-- Replace [gRPC gateway](https://github.com/grpc-ecosystem/grpc-gateway) endpoint `/v3beta` with [`/v3`](https://github.com/coreos/etcd/pull/9298).
-  - Deprecated [`/v3alpha`](https://github.com/coreos/etcd/pull/9298).
-  - To deprecate [`/v3beta`](https://github.com/coreos/etcd/issues/9189) in v3.5.
-  - In v3.4, `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` still works as a fallback to `curl -L http://localhost:2379/v3/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'`, but `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` won't work in v3.5. Use `curl -L http://localhost:2379/v3/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` instead.
-- Change [`wal` package function signatures](https://github.com/coreos/etcd/pull/9572) to support [structured logger and logging to file](https://github.com/coreos/etcd/issues/9438) in server-side.
-  - Previously, `Open(dirpath string, snap walpb.Snapshot) (*WAL, error)`, now `Open(lg *zap.Logger, dirpath string, snap walpb.Snapshot) (*WAL, error)`.
-  - Previously, `OpenForRead(dirpath string, snap walpb.Snapshot) (*WAL, error)`, now `OpenForRead(lg *zap.Logger, dirpath string, snap walpb.Snapshot) (*WAL, error)`.
-  - Previously, `Repair(dirpath string) bool`, now `Repair(lg *zap.Logger, dirpath string) bool`.
-  - Previously, `Create(dirpath string, metadata []byte) (*WAL, error)`, now `Create(lg *zap.Logger, dirpath string, metadata []byte) (*WAL, error)`.
-- Remove [`pkg/cors` package](https://github.com/coreos/etcd/pull/9490).
-- Change [`etcd --experimental-enable-v2v3`](TODO) flag to `etcd --enable-v2v3`; v2 storage emulation is now stable.
-- Move internal packages to `etcdserver`.
-  - `"github.com/coreos/etcd/alarm"` to `"github.com/coreos/etcd/etcdserver/api/v3alarm"`.
-  - `"github.com/coreos/etcd/compactor"` to `"github.com/coreos/etcd/etcdserver/api/v3compactor"`.
-  - `"github.com/coreos/etcd/discovery"` to `"github.com/coreos/etcd/etcdserver/api/v2discovery"`.
-  - `"github.com/coreos/etcd/etcdserver/auth"` to `"github.com/coreos/etcd/etcdserver/api/v2auth"`.
-  - `"github.com/coreos/etcd/etcdserver/membership"` to `"github.com/coreos/etcd/etcdserver/api/membership"`.
-  - `"github.com/coreos/etcd/etcdserver/stats"` to `"github.com/coreos/etcd/etcdserver/api/v2stats"`.
-  - `"github.com/coreos/etcd/error"` to `"github.com/coreos/etcd/etcdserver/api/v2error"`.
-  - `"github.com/coreos/etcd/rafthttp"` to `"github.com/coreos/etcd/etcdserver/api/rafthttp"`.
-  - `"github.com/coreos/etcd/snap"` to `"github.com/coreos/etcd/etcdserver/api/snap"`.
-  - `"github.com/coreos/etcd/store"` to `"github.com/coreos/etcd/etcdserver/api/v2store"`.
-- Change [snapshot file permissions](https://github.com/coreos/etcd/pull/9977): On Linux, the snapshot file changes from readable by all (mode 0644) to readable by the user only (mode 0600).
-
-### Dependency
-
-- Upgrade [`google.golang.org/grpc`](https://github.com/grpc/grpc-go/releases) from [**`v1.7.5`**](https://github.com/grpc/grpc-go/releases/tag/v1.7.5) to [**`v1.13.0`**](https://github.com/grpc/grpc-go/releases/tag/v1.13.0).
-- Upgrade [`github.com/golang/protobuf`](https://github.com/golang/protobuf/releases) from [**`golang/protobuf@1e59b77b5`**](https://github.com/golang/protobuf/commit/1e59b77b52bf8e4b449a57e6f79f21226d571845) to [**`v1.1.0`**](https://github.com/golang/protobuf/releases/tag/v1.1.0).
-- Upgrade [`golang.org/x/crypto`](https://github.com/golang/crypto) from [**`crypto@9419663f5`**](https://github.com/golang/crypto/commit/9419663f5a44be8b34ca85f08abc5fe1be11f8a3) to [**`crypto@8ac0e0d97`**](https://github.com/golang/crypto/commit/8ac0e0d97ce45cd83d1d7243c060cb8461dda5e9).
-- Upgrade [`golang.org/x/net`](https://github.com/golang/net) from [**`net@66aacef3d`**](https://github.com/golang/net/commit/66aacef3dd8a676686c7ae3716979581e8b03c47) to [**`net@db08ff08e`**](https://github.com/golang/net/commit/db08ff08e8622530d9ed3a0e8ac279f6d4c02196).
-- Upgrade [`golang.org/x/sys`](https://github.com/golang/sys) from [**`sys@ebfc5b463`**](https://github.com/golang/sys/commit/ebfc5b4631820b793c9010c87fd8fef0f39eb082) to [**`sys@56ede360e`**](https://github.com/golang/sys/commit/56ede360ec1c541828fb88741b3f1049406d28f5).
-- Upgrade [`golang.org/x/text`](https://github.com/golang/text) from [**`text@b19bf474d`**](https://github.com/golang/text/commit/b19bf474d317b857955b12035d2c5acb57ce8b01) to [**`text@f21a4dfb5`**](https://github.com/golang/text/commit/f21a4dfb5e38f5895301dc265a8def02365cc3d0).
-- Upgrade [`golang.org/x/time`](https://github.com/golang/time) from [**`time@c06e80d93`**](https://github.com/golang/time/commit/c06e80d9300e4443158a03817b8a8cb37d230320) to [**`time@fbb02b229`**](https://github.com/golang/time/commit/fbb02b2291d28baffd63558aa44b4b56f178d650).
-- Upgrade [`github.com/golang/protobuf`](https://github.com/golang/protobuf/releases) from [**`golang/protobuf@1e59b77b5`**](https://github.com/golang/protobuf/commit/1e59b77b52bf8e4b449a57e6f79f21226d571845) to [**`v1.1.0`**](https://github.com/golang/protobuf/releases/tag/v1.1.0).
-- Upgrade [`gopkg.in/yaml.v2`](https://github.com/go-yaml/yaml/releases) from [**`yaml@cd8b52f82`**](https://github.com/go-yaml/yaml/commit/cd8b52f8269e0feb286dfeef29f8fe4d5b397e0b) to [**`yaml@5420a8b67`**](https://github.com/go-yaml/yaml/commit/5420a8b6744d3b0345ab293f6fcba19c978f1183).
-- Upgrade [`github.com/dgrijalva/jwt-go`](https://github.com/dgrijalva/jwt-go/releases) from [**`v3.0.0`**](https://github.com/dgrijalva/jwt-go/releases/tag/v3.0.0) to [**`v3.2.0`**](https://github.com/dgrijalva/jwt-go/releases/tag/v3.2.0).
-- Upgrade [`github.com/ugorji/go/codec`](https://github.com/ugorji/go/releases) to [**`v1.1.1`**](https://github.com/ugorji/go/releases/tag/v1.1.1), and [regenerate v2 `client`](https://github.com/coreos/etcd/pull/9494).
-- Upgrade [`github.com/soheilhy/cmux`](https://github.com/soheilhy/cmux/releases) from [**`v0.1.3`**](https://github.com/soheilhy/cmux/releases/tag/v0.1.3) to [**`v0.1.4`**](https://github.com/soheilhy/cmux/releases/tag/v0.1.4).
-- Upgrade [`github.com/google/btree`](https://github.com/google/btree/releases) from [**`google/btree@925471ac9`**](https://github.com/google/btree/commit/925471ac9e2131377a91e1595defec898166fe49) to [**`google/btree@e89373fe6`**](https://github.com/google/btree/commit/e89373fe6b4a7413d7acd6da1725b83ef713e6e4).
-- Upgrade [`github.com/spf13/cobra`](https://github.com/spf13/cobra/releases) from [**`spf13/cobra@1c44ec8d3`**](https://github.com/spf13/cobra/commit/1c44ec8d3f1552cac48999f9306da23c4d8a288b) to [**`v0.0.3`**](https://github.com/spf13/cobra/releases/tag/v0.0.3).
-- Upgrade [`github.com/spf13/pflag`](https://github.com/spf13/pflag/releases) from [**`v1.0.0`**](https://github.com/spf13/pflag/releases/tag/v1.0.0) to [**`spf13/pflag@1ce0cc6db`**](https://github.com/spf13/pflag/commit/1ce0cc6db4029d97571db82f85092fccedb572ce).
-- Upgrade [`github.com/coreos/go-systemd`](https://github.com/coreos/go-systemd/releases) from [**`v15`**](https://github.com/coreos/go-systemd/releases/tag/v15) to [**`v17`**](https://github.com/coreos/go-systemd/releases/tag/v17).
-- Upgrade [`github.com/prometheus/client_golang`](https://github.com/prometheus/client_golang/releases) from [**``prometheus/client_golang@5cec1d042``**](https://github.com/prometheus/client_golang/commit/5cec1d0429b02e4323e042eb04dafdb079ddf568) to [**`v0.8.0`**](https://github.com/prometheus/client_golang/releases/tag/v0.8.0).
-- Upgrade [`github.com/grpc-ecosystem/go-grpc-prometheus`](https://github.com/grpc-ecosystem/go-grpc-prometheus/releases) from [**``grpc-ecosystem/go-grpc-prometheus@0dafe0d49``**](https://github.com/grpc-ecosystem/go-grpc-prometheus/commit/0dafe0d496ea71181bf2dd039e7e3f44b6bd11a7) to [**`v1.2.0`**](https://github.com/grpc-ecosystem/go-grpc-prometheus/releases/tag/v1.2.0).
-- Upgrade [`github.com/grpc-ecosystem/grpc-gateway`](https://github.com/grpc-ecosystem/grpc-gateway/releases) from [**`v1.3.1`**](https://github.com/grpc-ecosystem/grpc-gateway/releases/tag/v1.3.1) to [**`v1.4.1`**](https://github.com/grpc-ecosystem/grpc-gateway/releases/tag/v1.4.1).
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#latest) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Add [`etcd_network_active_peers`](https://github.com/coreos/etcd/pull/9762) Prometheus metric.
-  - Let's say `"7339c4e5e833c029"` server `/metrics` returns `etcd_network_active_peers{Local="7339c4e5e833c029",Remote="729934363faa4a24"} 1` and `etcd_network_active_peers{Local="7339c4e5e833c029",Remote="b548c2511513015"} 1`. This indicates that the local node `"7339c4e5e833c029"` currently has two active remote peers `"729934363faa4a24"` and `"b548c2511513015"` in a 3-node cluster. If the node `"b548c2511513015"` is down, the local node `"7339c4e5e833c029"` will show `etcd_network_active_peers{Local="7339c4e5e833c029",Remote="729934363faa4a24"} 1` and `etcd_network_active_peers{Local="7339c4e5e833c029",Remote="b548c2511513015"} 0`.
-- Add [`etcd_network_disconnected_peers_total`](https://github.com/coreos/etcd/pull/9762) Prometheus metric.
-  - If a remote peer `"b548c2511513015"` is down, the local node `"7339c4e5e833c029"` server `/metrics` would return `etcd_network_disconnected_peers_total{Local="7339c4e5e833c029",Remote="b548c2511513015"} 1`, while active peer metrics will show `etcd_network_active_peers{Local="7339c4e5e833c029",Remote="729934363faa4a24"} 1` and `etcd_network_active_peers{Local="7339c4e5e833c029",Remote="b548c2511513015"} 0`.
-- Add [`etcd_network_server_stream_failures_total`](https://github.com/coreos/etcd/pull/9760) Prometheus metric.
-  - e.g. `etcd_network_server_stream_failures_total{API="lease-keepalive",Type="receive"} 1`
-  - e.g. `etcd_network_server_stream_failures_total{API="watch",Type="receive"} 1`
-- Increase [`etcd_network_peer_round_trip_time_seconds`](https://github.com/coreos/etcd/pull/9762) Prometheus metric histogram upper-bound.
-  - Previously, highest bucket only collects requests taking 0.8192 seconds or more.
-  - Now, highest buckets collect 0.8192 seconds, 1.6384 seconds, and 3.2768 seconds or more.
-- Add [`etcd_server_is_leader`](https://github.com/coreos/etcd/pull/9587) Prometheus metric.
-- Add [`etcd_server_version`](https://github.com/coreos/etcd/pull/8960) Prometheus metric.
-  - To replace [Kubernetes `etcd-version-monitor`](https://github.com/coreos/etcd/issues/8948).
-- Add [`etcd_server_go_version`](https://github.com/coreos/etcd/pull/9957) Prometheus metric.
-- Add [`etcd_server_heartbeat_send_failures_total`](https://github.com/coreos/etcd/pull/9761) Prometheus metric.
-- Add [`etcd_server_slow_apply_total`](https://github.com/coreos/etcd/pull/9761) Prometheus metric.
-- Add [`etcd_server_slow_read_indexes_total`](https://github.com/coreos/etcd/pull/9897) Prometheus metric.
-- Add [`etcd_server_quota_backend_bytes`](https://github.com/coreos/etcd/pull/9820) Prometheus metric.
-  - Use it with `etcd_mvcc_db_total_size_in_bytes` and `etcd_mvcc_db_total_size_in_use_in_bytes`.
-  - `etcd_server_quota_backend_bytes 2.147483648e+09` means current quota size is 2 GB.
-  - `etcd_mvcc_db_total_size_in_bytes 20480` means current physically allocated DB size is 20 KB.
-  - `etcd_mvcc_db_total_size_in_use_in_bytes 16384` means future DB size if defragment operation is complete.
-  - `etcd_mvcc_db_total_size_in_bytes - etcd_mvcc_db_total_size_in_use_in_bytes` is the number of bytes that can be saved on disk with defragment operation.
-- Add [`etcd_mvcc_db_total_size_in_bytes`](https://github.com/coreos/etcd/pull/9819) Prometheus metric.
-  - Renamed from [`etcd_debugging_mvcc_db_total_size_in_bytes`](https://github.com/coreos/etcd/pull/9819).
-- Add [`etcd_mvcc_db_total_size_in_use_in_bytes`](https://github.com/coreos/etcd/pull/9256) Prometheus metric.
-  - Use it with `etcd_mvcc_db_total_size_in_bytes` and `etcd_mvcc_db_total_size_in_use_in_bytes`.
-  - `etcd_server_quota_backend_bytes 2.147483648e+09` means current quota size is 2 GB.
-  - `etcd_mvcc_db_total_size_in_bytes 20480` means current physically allocated DB size is 20 KB.
-  - `etcd_mvcc_db_total_size_in_use_in_bytes 16384` means future DB size if defragment operation is complete.
-  - `etcd_mvcc_db_total_size_in_bytes - etcd_mvcc_db_total_size_in_use_in_bytes` is the number of bytes that can be saved on disk with defragment operation.
-- Add [`etcd_snap_fsync_duration_seconds`](https://github.com/coreos/etcd/pull/9762) Prometheus metric.
-- Add [`etcd_disk_backend_defrag_duration_seconds`](https://github.com/coreos/etcd/pull/9761) Prometheus metric.
-- Add [`etcd_mvcc_hash_duration_seconds`](https://github.com/coreos/etcd/pull/9761) Prometheus metric.
-- Add [`etcd_mvcc_hash_rev_duration_seconds`](https://github.com/coreos/etcd/pull/9761) Prometheus metric.
-- Add [`etcd_debugging_disk_backend_commit_rebalance_duration_seconds`](https://github.com/coreos/etcd/pull/9834) Prometheus metric.
-- Add [`etcd_debugging_disk_backend_commit_spill_duration_seconds`](https://github.com/coreos/etcd/pull/9834) Prometheus metric.
-- Add [`etcd_debugging_disk_backend_commit_write_duration_seconds`](https://github.com/coreos/etcd/pull/9834) Prometheus metric.
-- Add [`etcd_debugging_lease_granted_total`](https://github.com/coreos/etcd/pull/9778) Prometheus metric.
-- Add [`etcd_debugging_lease_revoked_total`](https://github.com/coreos/etcd/pull/9778) Prometheus metric.
-- Add [`etcd_debugging_lease_renewed_total`](https://github.com/coreos/etcd/pull/9778) Prometheus metric.
-- Add [`etcd_debugging_lease_ttl_total`](https://github.com/coreos/etcd/pull/9778) Prometheus metric.
-- Increase [`etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds`](https://github.com/coreos/etcd/pull/9762) Prometheus metric histogram upper-bound.
-  - Previously, highest bucket only collects requests taking 1.024 seconds or more.
-  - Now, highest buckets collect 1.024 seconds, 2.048 seconds, and 4.096 seconds or more.
-- Fix missing [`etcd_network_peer_sent_failures_total`](https://github.com/coreos/etcd/pull/9437) Prometheus metric count.
-- Fix [`etcd_debugging_server_lease_expired_total`](https://github.com/coreos/etcd/pull/9557) Prometheus metric.
-- Fix [race conditions in v2 server stat collecting](https://github.com/coreos/etcd/pull/9562).
-
-### Security, Authentication
-
-See [security doc](https://github.com/coreos/etcd/blob/master/Documentation/op-guide/security.md) for more details.
-
-- Support TLS cipher suite whitelisting.
-  - To block [weak cipher suites](https://github.com/coreos/etcd/issues/8320).
-  - TLS handshake fails when client hello is requested with invalid cipher suites.
-  - Add [`etcd --cipher-suites`](https://github.com/coreos/etcd/pull/9801) flag.
-  - If empty, Go auto-populates the list.
-- Add [`etcd --host-whitelist`](https://github.com/coreos/etcd/pull/9372) flag, [`etcdserver.Config.HostWhitelist`](https://github.com/coreos/etcd/pull/9372), and [`embed.Config.HostWhitelist`](https://github.com/coreos/etcd/pull/9372), to prevent ["DNS Rebinding"](https://en.wikipedia.org/wiki/DNS_rebinding) attack.
-  - Any website can simply create an authorized DNS name, and direct DNS to `"localhost"` (or any other address). Then, all HTTP endpoints of etcd server listening on `"localhost"` becomes accessible, thus vulnerable to [DNS rebinding attacks (CVE-2018-5702)](https://bugs.chromium.org/p/project-zero/issues/detail?id=1447#c2).
-  - Client origin enforce policy works as follow:
-    - If client connection is secure via HTTPS, allow any hostnames..
-    - If client connection is not secure and `"HostWhitelist"` is not empty, only allow HTTP requests whose Host field is listed in whitelist.
-  - By default, `"HostWhitelist"` is `"*"`, which means insecure server allows all client HTTP requests.
-  - Note that the client origin policy is enforced whether authentication is enabled or not, for tighter controls.
-  - When specifying hostnames, loopback addresses are not added automatically. To allow loopback interfaces, add them to whitelist manually (e.g. `"localhost"`, `"127.0.0.1"`, etc.).
-  - e.g. `etcd --host-whitelist example.com`, then the server will reject all HTTP requests whose Host field is not `example.com` (also rejects requests to `"localhost"`).
-- Support [`etcd --cors`](https://github.com/coreos/etcd/pull/9490) in v3 HTTP requests (gRPC gateway).
-- Support [`ttl` field for `etcd` Authentication JWT token](https://github.com/coreos/etcd/pull/8302).
-  - e.g. `etcd --auth-token jwt,pub-key=<pub key path>,priv-key=<priv key path>,sign-method=<sign method>,ttl=5m`.
-- Allow empty token provider in [`etcdserver.ServerConfig.AuthToken`](https://github.com/coreos/etcd/pull/9369).
-- Fix [TLS reload](https://github.com/coreos/etcd/pull/9570) when [certificate SAN field only includes IP addresses but no domain names](https://github.com/coreos/etcd/issues/9541).
-  - In Go, server calls `(*tls.Config).GetCertificate` for TLS reload if and only if server's `(*tls.Config).Certificates` field is not empty, or `(*tls.ClientHelloInfo).ServerName` is not empty with a valid SNI from the client. Previously, etcd always populates `(*tls.Config).Certificates` on the initial client TLS handshake, as non-empty. Thus, client was always expected to supply a matching SNI in order to pass the TLS verification and to trigger `(*tls.Config).GetCertificate` to reload TLS assets.
-  - However, a certificate whose SAN field does [not include any domain names but only IP addresses](https://github.com/coreos/etcd/issues/9541) would request `*tls.ClientHelloInfo` with an empty `ServerName` field, thus failing to trigger the TLS reload on initial TLS handshake; this becomes a problem when expired certificates need to be replaced online.
-  - Now, `(*tls.Config).Certificates` is created empty on initial TLS client handshake, first to trigger `(*tls.Config).GetCertificate`, and then to populate rest of the certificates on every new TLS connection, even when client SNI is empty (e.g. cert only includes IPs).
-
-### etcd server
-
-- Add [`etcd --initial-election-tick-advance`](https://github.com/coreos/etcd/pull/9591) flag to configure initial election tick fast-forward.
-  - By default, `etcd --initial-election-tick-advance=true`, then local member fast-forwards election ticks to speed up "initial" leader election trigger.
-  - This benefits the case of larger election ticks. For instance, cross datacenter deployment may require longer election timeout of 10-second. If true, local node does not need wait up to 10-second. Instead, forwards its election ticks to 8-second, and have only 2-second left before leader election.
-  - Major assumptions are that: cluster has no active leader thus advancing ticks enables faster leader election. Or cluster already has an established leader, and rejoining follower is likely to receive heartbeats from the leader after tick advance and before election timeout.
-  - However, when network from leader to rejoining follower is congested, and the follower does not receive leader heartbeat within left election ticks, disruptive election has to happen thus affecting cluster availabilities.
-  - Now, this can be disabled by setting `etcd --initial-election-tick-advance=false`.
-  - Disabling this would slow down initial bootstrap process for cross datacenter deployments. Make tradeoffs by configuring `etcd --initial-election-tick-advance` at the cost of slow initial bootstrap.
-  - If single-node, it advances ticks regardless.
-  - Address [disruptive rejoining follower node](https://github.com/coreos/etcd/issues/9333).
-- Add [`etcd --pre-vote`](https://github.com/coreos/etcd/pull/9352) flag to enable to run an additional Raft election phase.
-  - For instance, a flaky(or rejoining) member may drop in and out, and start campaign. This member will end up with a higher term, and ignore all incoming messages with lower term. In this case, a new leader eventually need to get elected, thus disruptive to cluster availability. Raft implements Pre-Vote phase to prevent this kind of disruptions. If enabled, Raft runs an additional phase of election to check if pre-candidate can get enough votes to win an election.
-  - `etcd --pre-vote=false` by default.
-  - v3.5 will enable `etcd --pre-vote=true` by default.
-- [`etcd --initial-corrupt-check`](TODO) flag is now stable (`etcd --experimental-initial-corrupt-check`haisbeen  deprecated).
-  - `etcd --initial-corrupt-check=true` by default, to check cluster database hashes before serving client/peer traffic.
-- [`etcd --corrupt-check-time`](TODO) flag is now stable (`etcd --experimental-corrupt-check-time`haisbeen  deprecated).
-  - `etcd --corrupt-check-time=12h` by default, to check cluster database hashes for every 12-hour.
-- [`etcd --enable-v2v3`](TODO) flag is now stable.
-  - `etcd --experimental-enable-v2v3` has been deprecated.
-  - Added [more v2v3 integration tests](https://github.com/coreos/etcd/pull/9634).
-  - `etcd --enable-v2=true --enable-v2v3=''` by default, to enable v2 API server that is backed by **v2 store**.
-  - `etcd --enable-v2=true --enable-v2v3=/aaa` to enable v2 API server that is backed by **v3 storage**.
-  - `etcd --enable-v2=false --enable-v2v3=''` to disable v2 API server.
-  - `etcd --enable-v2=false --enable-v2v3=/aaa` to disable v2 API server. TODO: error?
-  - Automatically [create parent directory if it does not exist](https://github.com/coreos/etcd/pull/9626) (fix [issue#9609](https://github.com/coreos/etcd/issues/9609)).
-  - v4.0 will configure `etcd --enable-v2=true --enable-v2v3=/aaa` to enable v2 API server that is backed by **v3 storage**.
-- Add [`etcd --discovery-srv-name`](https://github.com/coreos/etcd/pull/8690) flag to support custom DNS SRV name with discovery.
-  - If not given, etcd queries `_etcd-server-ssl._tcp.[YOUR_HOST]` and `_etcd-server._tcp.[YOUR_HOST]`.
-  - If `etcd --discovery-srv-name="foo"`, then query `_etcd-server-ssl-foo._tcp.[YOUR_HOST]` and `_etcd-server-foo._tcp.[YOUR_HOST]`.
-  - Useful for operating multiple etcd clusters under the same domain.
-- Support TLS cipher suite whitelisting.
-  - To block [weak cipher suites](https://github.com/coreos/etcd/issues/8320).
-  - TLS handshake fails when client hello is requested with invalid cipher suites.
-  - Add [`etcd --cipher-suites`](https://github.com/coreos/etcd/pull/9801) flag.
-  - If empty, Go auto-populates the list.
-- Support [`etcd --cors`](https://github.com/coreos/etcd/pull/9490) in v3 HTTP requests (gRPC gateway).
-- Rename [`etcd --log-output` to `etcd --log-outputs`](https://github.com/coreos/etcd/pull/9624) to support multiple log outputs.
-  - **`etcd --log-output` will be deprecated in v3.5**.
-- Add [`etcd --logger`](https://github.com/coreos/etcd/pull/9572) flag to support [structured logger and multiple log outputs](https://github.com/coreos/etcd/issues/9438) in server-side.
-  - **`etcd --logger=capnslog` will be deprecated in v3.5**.
-  - Main motivation is to promote automated etcd monitoring, rather than looking back server logs when it starts breaking. Future development will make etcd log as few as possible, and make etcd easier to monitor with metrics and alerts.
-  - `etcd --logger=capnslog --log-outputs=default` is the default setting and same as previous etcd server logging format.
-  - `etcd --logger=zap --log-outputs=default` is not supported when `etcd --logger=zap`.
-    - Instead, use `etcd --logger=zap --log-outputs=stderr`.
-    - Or, use `etcd --logger=zap --log-outputs=systemd/journal` to send logs to the local systemd journal.
-    - Previously, if etcd parent process ID (PPID) is 1 (e.g. run with systemd), `etcd --logger=capnslog --log-outputs=default` redirects server logs to local systemd journal. And if write to journald fails, it writes to `os.Stderr` as a fallback.
-    - However, even with PPID 1, it can fail to dial systemd journal (e.g. run embedded etcd with Docker container). Then, [every single log write will fail](https://github.com/coreos/etcd/pull/9729) and fall back to `os.Stderr`, which is inefficient.
-    - To avoid this problem, systemd journal logging must be configured manually.
-  - `etcd --logger=zap --log-outputs=stderr` will log server operations in [JSON-encoded format](https://godoc.org/go.uber.org/zap#NewProductionEncoderConfig) and writes logs to `os.Stderr`. Use this to override journald log redirects.
-  - `etcd --logger=zap --log-outputs=stdout` will log server operations in [JSON-encoded format](https://godoc.org/go.uber.org/zap#NewProductionEncoderConfig) and writes logs to `os.Stdout` Use this to override journald log redirects.
-  - `etcd --logger=zap --log-outputs=a.log` will log server operations in [JSON-encoded format](https://godoc.org/go.uber.org/zap#NewProductionEncoderConfig) and writes logs to the specified file `a.log`.
-  - `etcd --logger=zap --log-outputs=a.log,b.log,c.log,stdout` [writes server logs to multiple files `a.log`, `b.log` and `c.log` at the same time](https://github.com/coreos/etcd/pull/9579) and outputs to `os.Stderr`, in [JSON-encoded format](https://godoc.org/go.uber.org/zap#NewProductionEncoderConfig).
-  - `etcd --logger=zap --log-outputs=/dev/null` will discard all server logs.
-- Fix [`mvcc` "unsynced" watcher restore operation](https://github.com/coreos/etcd/pull/9281).
-  - "unsynced" watcher is watcher that needs to be in sync with events that have happened.
-  - That is, "unsynced" watcher is the slow watcher that was requested on old revision.
-  - "unsynced" watcher restore operation was not correctly populating its underlying watcher group.
-  - Which possibly causes [missing events from "unsynced" watchers](https://github.com/coreos/etcd/issues/9086).
-  - A node gets network partitioned with a watcher on a future revision, and falls behind receiving a leader snapshot after partition gets removed. When applying this snapshot, etcd watch storage moves current synced watchers to unsynced since sync watchers might have become stale during network partition. And reset synced watcher group to restart watcher routines. Previously, there was a bug when moving from synced watcher group to unsynced, thus client would miss events when the watcher was requested to the network-partitioned node.
-- Fix [`mvcc` server panic from restore operation](https://github.com/coreos/etcd/pull/9775).
-  - Let's assume that a watcher had been requested with a future revision X and sent to node A that became network-partitioned thereafter. Meanwhile, cluster makes progress. Then when the partition gets removed, the leader sends a snapshot to node A. Previously if the snapshot's latest revision is still lower than the watch revision X,  **etcd server panicked** during snapshot restore operation.
-  - Now, this server-side panic has been fixed.
-- Fix [server panic on invalid Election Proclaim/Resign HTTP(S) requests](https://github.com/coreos/etcd/pull/9379).
-  - Previously, wrong-formatted HTTP requests to Election API could trigger panic in etcd server.
-  - e.g. `curl -L http://localhost:2379/v3/election/proclaim -X POST -d '{"value":""}'`, `curl -L http://localhost:2379/v3/election/resign -X POST -d '{"value":""}'`.
-- Fix [revision-based compaction retention parsing](https://github.com/coreos/etcd/pull/9339).
-  - Previously, `etcd --auto-compaction-mode revision --auto-compaction-retention 1` was [translated to revision retention 3600000000000](https://github.com/coreos/etcd/issues/9337).
-  - Now, `etcd --auto-compaction-mode revision --auto-compaction-retention 1` is correctly parsed as revision retention 1.
-- Prevent [overflow by large `TTL` values for `Lease` `Grant`](https://github.com/coreos/etcd/pull/9399).
-  - `TTL` parameter to `Grant` request is unit of second.
-  - Leases with too large `TTL` values exceeding `math.MaxInt64` [expire in unexpected ways](https://github.com/coreos/etcd/issues/9374).
-  - Server now returns `rpctypes.ErrLeaseTTLTooLarge` to client, when the requested `TTL` is larger than *9,000,000,000 seconds* (which is >285 years).
-  - Again, etcd `Lease` is meant for short-periodic keepalives or sessions, in the range of seconds or minutes. Not for hours or days!
-- Enable etcd server [`raft.Config.CheckQuorum` when starting with `ForceNewCluster`](https://github.com/coreos/etcd/pull/9347).
-- Allow [non-WAL files in `etcd --wal-dir` directory](https://github.com/coreos/etcd/pull/9743).
-  - Previously, existing files such as [`lost+found`](https://github.com/coreos/etcd/issues/7287) in WAL directory prevent etcd server boot.
-  - Now, WAL directory that contains only `lost+found` or a file that's not suffixed with `.wal` is considered non-initialized.
-
-### API
-
-- Add [`snapshot`](https://github.com/coreos/etcd/pull/9118) package for snapshot restore/save operations (see [`godoc.org/github.com/etcd/clientv3/snapshot`](https://godoc.org/github.com/coreos/etcd/clientv3/snapshot) for more).
-- Add [`watch_id` field to `etcdserverpb.WatchCreateRequest`](https://github.com/coreos/etcd/pull/9065) to allow user-provided watch ID to `mvcc`.
-  - Corresponding `watch_id` is returned via `etcdserverpb.WatchResponse`, if any.
-- Add [`fragment` field to `etcdserverpb.WatchCreateRequest`](https://github.com/coreos/etcd/pull/9291) to request etcd server to [split watch events](https://github.com/coreos/etcd/issues/9294) when the total size of events exceeds `etcd --max-request-bytes` flag value plus gRPC-overhead 512 bytes.
-  - The default server-side request bytes limit is `embed.DefaultMaxRequestBytes` which is 1.5 MiB plus gRPC-overhead 512 bytes.
-  - If watch response events exceed this server-side request limit and watch request is created with `fragment` field `true`, the server will split watch events into a set of chunks, each of which is a subset of watch events below server-side request limit.
-  - Useful when client-side has limited bandwidths.
-  - For example, watch response contains 10 events, where each event is 1 MiB. And server `etcd --max-request-bytes` flag value is 1 MiB. Then, server will send 10 separate fragmented events to the client.
-  - For example, watch response contains 5 events, where each event is 2 MiB. And server `etcd --max-request-bytes` flag value is 1 MiB and `clientv3.Config.MaxCallRecvMsgSize` is 1 MiB. Then, server will try to send 5 separate fragmented events to the client, and the client will error with `"code = ResourceExhausted desc = grpc: received message larger than max (...)"`.
-  - Client must implement fragmented watch event merge (which `clientv3` does in etcd v3.4).
-- Add [`raftAppliedIndex` field to `etcdserverpb.StatusResponse`](https://github.com/coreos/etcd/pull/9176) for current Raft applied index.
-- Add [`errors` field to `etcdserverpb.StatusResponse`](https://github.com/coreos/etcd/pull/9206) for server-side error.
-  - e.g. `"etcdserver: no leader", "NOSPACE", "CORRUPT"`
-- Add [`dbSizeInUse` field to `etcdserverpb.StatusResponse`](https://github.com/coreos/etcd/pull/9256) for actual DB size after compaction.
-- Add [`WatchRequest.WatchProgressRequest`](https://github.com/coreos/etcd/pull/9869).
-  - To manually trigger broadcasting watch progress event (empty watch response with latest header) to all associated watch streams.
-  - Think of it as `WithProgressNotify` that can be triggered manually.
-
-Note: **v3.5 will deprecate `etcd --log-package-levels` flag for `capnslog`**; `etcd --logger=zap --log-outputs=stderr` will the default. **v3.5 will deprecate `[CLIENT-URL]/config/local/log` endpoint.**
-
-### Package `embed`
-
-- Add [`embed.Config.CipherSuites`](https://github.com/coreos/etcd/pull/9801) to specify a list of supported cipher suites for TLS handshake between client/server  and peers.
-  - If empty, Go auto-populates the list.
-  - Both `embed.Config.ClientTLSInfo.CipherSuites` and `embed.Config.CipherSuites` cannot be non-empty at the same time.
-  - If not empty, specify either `embed.Config.ClientTLSInfo.CipherSuites` or `embed.Config.CipherSuites`.
-- Add [`embed.Config.InitialElectionTickAdvance`](https://github.com/coreos/etcd/pull/9591) to enable/disable initial election tick fast-forward.
-  - `embed.NewConfig()` would return `*embed.Config` with `InitialElectionTickAdvance` as true by default.
-- Define [`embed.CompactorModePeriodic`](https://godoc.org/github.com/coreos/etcd/embed#pkg-variables) for `compactor.ModePeriodic`.
-- Define [`embed.CompactorModeRevision`](https://godoc.org/github.com/coreos/etcd/embed#pkg-variables) for `compactor.ModeRevision`.
-- Change [`embed.Config.CorsInfo` in `*cors.CORSInfo` type to `embed.Config.CORS` in `map[string]struct{}` type](https://github.com/coreos/etcd/pull/9490).
-- Remove [`embed.Config.SetupLogging`](https://github.com/coreos/etcd/pull/9572).
-  - Now logger is set up automatically based on [`embed.Config.Logger`, `embed.Config.LogOutputs`, `embed.Config.Debug` fields](https://github.com/coreos/etcd/pull/9572).
-- Add [`embed.Config.Logger`](https://github.com/coreos/etcd/pull/9518) to support [structured logger `zap`](https://github.com/uber-go/zap) in server-side.
-- Rename `embed.Config.SnapCount` field to [`embed.Config.SnapshotCount`](https://github.com/coreos/etcd/pull/9745), to be consistent with the flag name `etcd --snapshot-count`.
-- Rename [**`embed.Config.LogOutput`** to **`embed.Config.LogOutputs`**](https://github.com/coreos/etcd/pull/9624) to support multiple log outputs.
-- Change [**`embed.Config.LogOutputs`** type from `string` to `[]string`](https://github.com/coreos/etcd/pull/9579) to support multiple log outputs.
-
-### Package `integration`
-
-- Add [`CLUSTER_DEBUG` to enable test cluster logging](https://github.com/coreos/etcd/pull/9678).
-  - Deprecated `capnslog` in integration tests.
-
-### client v3
-
-- Add [`WithFragment` `OpOption`](https://github.com/coreos/etcd/pull/9291) to support [watch events fragmentation](https://github.com/coreos/etcd/issues/9294) when the total size of events exceeds `etcd --max-request-bytes` flag value plus gRPC-overhead 512 bytes.
-  - Watch fragmentation is disabled by default.
-  - The default server-side request bytes limit is `embed.DefaultMaxRequestBytes` which is 1.5 MiB plus gRPC-overhead 512 bytes.
-  - If watch response events exceed this server-side request limit and watch request is created with `fragment` field `true`, the server will split watch events into a set of chunks, each of which is a subset of watch events below server-side request limit.
-  - Useful when client-side has limited bandwidths.
-  - For example, watch response contains 10 events, where each event is 1 MiB. And server `etcd --max-request-bytes` flag value is 1 MiB. Then, server will send 10 separate fragmented events to the client.
-  - For example, watch response contains 5 events, where each event is 2 MiB. And server `etcd --max-request-bytes` flag value is 1 MiB and `clientv3.Config.MaxCallRecvMsgSize` is 1 MiB. Then, server will try to send 5 separate fragmented events to the client, and the client will error with `"code = ResourceExhausted desc = grpc: received message larger than max (...)"`.
-- Add [`Watcher.RequestProgress` method](https://github.com/coreos/etcd/pull/9869).
-  - To manually trigger broadcasting watch progress event (empty watch response with latest header) to all associated watch streams.
-  - Think of it as `WithProgressNotify` that can be triggered manually.
-- Fix [lease keepalive interval updates when response queue is full](https://github.com/coreos/etcd/pull/9952).
-  - If `<-chan *clientv3LeaseKeepAliveResponse` from `clientv3.Lease.KeepAlive` was never consumed or channel is full, client was [sending keepalive request every 500ms](https://github.com/coreos/etcd/issues/9911) instead of expected rate of every "TTL / 3" duration.
-- Change [snapshot file permissions](https://github.com/coreos/etcd/pull/9977): On Linux, the snapshot file changes from readable by all (mode 0644) to readable by the user only (mode 0600).
-
-### etcdctl v3
-
-- Make [`ETCDCTL_API=3 etcdctl` default](https://github.com/coreos/etcd/issues/9600).
-  - Now, `etcdctl set foo bar` must be `ETCDCTL_API=2 etcdctl set foo bar`.
-  - Now, `ETCDCTL_API=3 etcdctl put foo bar` could be just `etcdctl put foo bar`.
-- Add [`etcdctl --password`](https://github.com/coreos/etcd/pull/9730) flag.
-  - To support [`:` character in user name](https://github.com/coreos/etcd/issues/9691).
-  - e.g. `etcdctl --user user --password password get foo`
-- Add [`etcdctl user add --new-user-password`](https://github.com/coreos/etcd/pull/9730) flag.
-- Add [`etcdctl check datascale`](https://github.com/coreos/etcd/pull/9185) command.
-- Add [`etcdctl check datascale --auto-compact, --auto-defrag`](https://github.com/coreos/etcd/pull/9351) flags.
-- Add [`etcdctl check perf --auto-compact, --auto-defrag`](https://github.com/coreos/etcd/pull/9330) flags.
-- Add [`etcdctl defrag --cluster`](https://github.com/coreos/etcd/pull/9390) flag.
-- Add ["raft applied index" field to `endpoint status`](https://github.com/coreos/etcd/pull/9176).
-- Add ["errors" field to `endpoint status`](https://github.com/coreos/etcd/pull/9206).
-- Add [`etcdctl endpoint health --write-out` support](https://github.com/coreos/etcd/pull/9540).
-  - Previously, [`etcdctl endpoint health --write-out json` did not work](https://github.com/coreos/etcd/issues/9532).
-- Fix [`etcdctl watch [key] [range_end] -- [exec-command…]`](https://github.com/coreos/etcd/pull/9688) parsing.
-  - Previously,  `ETCDCTL_API=3 etcdctl watch foo -- echo watch event received` panicked.
-- Fix [`etcdctl move-leader` command for TLS-enabled endpoints](https://github.com/coreos/etcd/pull/9807).
-- Add [`progress` command to `etcdctl watch --interactive`](https://github.com/coreos/etcd/pull/9869).
-  - To manually trigger broadcasting watch progress event (empty watch response with latest header) to all associated watch streams.
-  - Think of it as `WithProgressNotify` that can be triggered manually.
-
-### gRPC proxy
-
-- Fix [etcd server panic from restore operation](https://github.com/coreos/etcd/pull/9775).
-  - Let's assume that a watcher had been requested with a future revision X and sent to node A that became network-partitioned thereafter. Meanwhile, cluster makes progress. Then when the partition gets removed, the leader sends a snapshot to node A. Previously if the snapshot's latest revision is still lower than the watch revision X,  **etcd server panicked** during snapshot restore operation.
-  - Especially, gRPC proxy was affected, since it detects a leader loss with a key `"proxy-namespace__lostleader"` and a watch revision `"int64(math.MaxInt64 - 2)"`.
-  - Now, this server-side panic has been fixed.
-
-### gRPC gateway
-
-- Replace [gRPC gateway](https://github.com/grpc-ecosystem/grpc-gateway) endpoint `/v3beta` with [`/v3`](https://github.com/coreos/etcd/pull/9298).
-  - Deprecated [`/v3alpha`](https://github.com/coreos/etcd/pull/9298).
-  - To deprecate [`/v3beta`](https://github.com/coreos/etcd/issues/9189) in v3.5.
-  - In v3.4, `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` still works as a fallback to `curl -L http://localhost:2379/v3/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'`, but `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` won't work in v3.5. Use `curl -L http://localhost:2379/v3/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` instead.
-- Add API endpoints [`/{v3beta,v3}/lease/leases, /{v3beta,v3}/lease/revoke, /{v3beta,v3}/lease/timetolive`](https://github.com/coreos/etcd/pull/9450).
-  - To deprecate [`/{v3beta,v3}/kv/lease/leases, /{v3beta,v3}/kv/lease/revoke, /{v3beta,v3}/kv/lease/timetolive`](https://github.com/coreos/etcd/issues/9430) in v3.5.
-- Support [`etcd --cors`](https://github.com/coreos/etcd/pull/9490) in v3 HTTP requests (gRPC gateway).
-
-### Package `raft`
-
-- Fix [deadlock during PreVote migration process](https://github.com/coreos/etcd/pull/8525).
-- Add [`raft.ErrProposalDropped`](https://github.com/coreos/etcd/pull/9067).
-  - Now [`(r *raft) Step` returns `raft.ErrProposalDropped`](https://github.com/coreos/etcd/pull/9137) if a proposal has been ignored.
-  - e.g. a node is removed from cluster, or [`raftpb.MsgProp` arrives at current leader while there is an ongoing leadership transfer](https://github.com/coreos/etcd/issues/8975).
-- Improve [Raft `becomeLeader` and `stepLeader`](https://github.com/coreos/etcd/pull/9073) by keeping track of latest `pb.EntryConfChange` index.
-  - Previously record `pendingConf` boolean field scanning the entire tail of the log, which can delay hearbeat send.
-- Fix [missing learner nodes on `(n *node) ApplyConfChange`](https://github.com/coreos/etcd/pull/9116).
-
-### Tooling
-
-- Add [`etcd-dump-logs --entry-type`](https://github.com/coreos/etcd/pull/9628) flag to support WAL log filtering by entry type.
-- Add [`etcd-dump-logs --stream-decoder`](https://github.com/coreos/etcd/pull/9790) flag to support custom decoder.
-
-### Go
-
-- Require *Go 1.10+*.
-- Compile with [*Go 1.10.3*](https://golang.org/doc/devel/release.html#go1.10).
-

CHANGELOG-3.5.md

@@ -1,43 +0,0 @@
-
-
-Previous change logs can be found at [CHANGELOG-3.4](https://github.com/coreos/etcd/blob/master/CHANGELOG-3.4.md).
-
-
-## v3.5.0 (TBD 2018-12)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.4.0...v3.5.0) and [v3.5 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_5.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v3.5 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_3_5.md).**
-
-### Breaking Changes
-
-- [gRPC gateway](https://github.com/grpc-ecosystem/grpc-gateway) only supports [`/v3`](TODO) endpoint.
-  - Deprecated [`/v3beta`](https://github.com/coreos/etcd/pull/9298).
-  - `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` does work in v3.5. Use `curl -L http://localhost:2379/v3/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` instead.
-- **`etcd --log-output` flag has been deprecated.** Use **`etcd --log-outputs`** instead.
-- **`etcd --logger=zap --log-outputs=stderr`** is now the default.
-- **`etcd --logger=capnslog` flag has been deprecated.**
-- **`etcd --logger=zap --log-outputs=default` flag value is not supported.**.
-  - Instead, use `etcd --logger=zap --log-outputs=stderr`.
-  - Or, use `etcd --logger=zap --log-outputs=systemd/journal` to send logs to the local systemd journal.
-  - Previously, if etcd parent process ID (PPID) is 1 (e.g. run with systemd), `etcd --logger=capnslog --log-outputs=default` redirects server logs to local systemd journal. And if write to journald fails, it writes to `os.Stderr` as a fallback.
-  - However, even with PPID 1, it can fail to dial systemd journal (e.g. run embedded etcd with Docker container). Then, [every single log write will fail](https://github.com/coreos/etcd/pull/9729) and fall back to `os.Stderr`, which is inefficient.
-  - To avoid this problem, systemd journal logging must be configured manually.
-- **`etcd --log-outputs=stderr`** is now the default.
-- **`etcd --log-package-levels` flag for `capnslog` has been deprecated.** Now, **`etcd --logger=zap --log-outputs=stderr`** is the default.
-- **`[CLIENT-URL]/config/local/log` endpoint has been deprecated, as is `etcd --log-package-levels` flag.**
-  - `curl http://127.0.0.1:2379/config/local/log -XPUT -d '{"Level":"DEBUG"}'` won't work.
-  - Please use `etcd --logger=zap --log-outputs=stderr` instead.
-- Deprecated `etcd_debugging_mvcc_db_total_size_in_bytes` Prometheus metric. Instead, use `etcd_mvcc_db_total_size_in_bytes`.
-
-### Metrics, Monitoring
-
-See [List of metrics](https://etcd.readthedocs.io/en/latest/operate.html#latest) for all metrics per release.
-
-Note that any `etcd_debugging_*` metrics are experimental and subject to change.
-
-- Deprecated `etcd_debugging_mvcc_db_total_size_in_bytes` Prometheus metric. Instead, use `etcd_mvcc_db_total_size_in_bytes`.
-
-### gRPC gateway
-
-- [gRPC gateway](https://github.com/grpc-ecosystem/grpc-gateway) only supports [`/v3`](TODO) endpoint.
-  - Deprecated [`/v3beta`](https://github.com/coreos/etcd/pull/9298).
-  - `curl -L http://localhost:2379/v3beta/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` does work in v3.5. Use `curl -L http://localhost:2379/v3/kv/put -X POST -d '{"key": "Zm9v", "value": "YmFy"}'` instead.

CHANGELOG-4.0.md

@@ -1,28 +0,0 @@
-
-
-Previous change logs can be found at [CHANGELOG-3.x](https://github.com/coreos/etcd/blob/master/CHANGELOG-3.x.md).
-
-
-Planned breaking changes.
-
-
-## v4.0.0 (TBD)
-
-See [code changes](https://github.com/coreos/etcd/compare/v3.3.0...v4.0.0) and [v4.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_4_0.md) for any breaking changes. **Again, before running upgrades from any previous release, please make sure to read change logs below and [v4.0 upgrade guide](https://github.com/coreos/etcd/blob/master/Documentation/upgrades/upgrade_4_0.md).**
-
-### Breaking Changes
-
-- [Secure etcd by default](https://github.com/coreos/etcd/issues/9475)?
-- Change `/health` endpoint output.
-  - Previously, `{"health":"true"}`.
-  - Now, `{"health":true}`.
-  - Breaks [Kubernetes `kubectl get componentstatuses` command](https://github.com/kubernetes/kubernetes/issues/58240).
-- Deprecate [`etcd --proxy*`](TODO) flags; **no more v2 proxy**.
-- Deprecate [v2 storage backend](https://github.com/coreos/etcd/issues/9232); **no more v2 store**.
-  - v2 API is still supported via [v2 emulation](TODO).
-- Deprecate [`etcdctl backup`](TODO) command.
-- `clientv3.Client.KeepAlive(ctx context.Context, id LeaseID) (<-chan *LeaseKeepAliveResponse, error)` is now [`clientv4.Client.KeepAlive(ctx context.Context, id LeaseID) <-chan *LeaseKeepAliveResponse`](TODO).
-  - Similar to `Watch`, [`KeepAlive` does not return errors](https://github.com/coreos/etcd/issues/7488).
-  - If there's an unknown server error, kill all open channels and create a new stream on the next `KeepAlive` call.
-- Rename `github.com/coreos/client` to `github.com/coreos/clientv2`.
-

CONTRIBUTING.md

@@ -14,7 +14,7 @@ etcd is Apache 2.0 licensed and accepts contributions via GitHub pull requests.
 
 ## Reporting bugs and creating issues
 
-Reporting bugs is one of the best ways to contribute. However, a good bug report has some very specific qualities, so please read over our short document on [reporting bugs](https://github.com/coreos/etcd/blob/master/Documentation/reporting_bugs.md) before submitting a bug report. This document might contain links to known issues, another good reason to take a look there before reporting a bug.
+Reporting bugs is one of the best ways to contribute. However, a good bug report has some very specific qualities, so please read over our short document on [reporting bugs](https://github.com/etcd-io/etcd/blob/master/Documentation/reporting_bugs.md) before submitting a bug report. This document might contain links to known issues, another good reason to take a look there before reporting a bug.
 
 ## Contribution flow
 
@@ -24,7 +24,7 @@ This is a rough outline of what a contributor's workflow looks like:
 - Make commits of logical units.
 - Make sure commit messages are in the proper format (see below).
 - Push changes in a topic branch to a personal fork of the repository.
-- Submit a pull request to coreos/etcd.
+- Submit a pull request to etcd-io/etcd.
 - The PR must receive a LGTM from two maintainers found in the MAINTAINERS file.
 
 Thanks for contributing!
@@ -42,9 +42,13 @@ questions: what changed and why. The subject line should feature the what and
 the body of the commit should describe the why.
 
 ```
-scripts: add the test-cluster command
+etcdserver: add grpc interceptor to log info on incoming requests
 
-this uses tmux to setup a test cluster that can easily be killed and started for debugging.
+To improve debuggability of etcd v3. Added a grpc interceptor to log
+info on incoming requests to etcd server. The log output includes
+remote client info, request content (with value field redacted), request
+handling latency, response size, etc. Uses zap logger if available,
+otherwise uses capnslog.
 
 Fixes #38
 ```
@@ -52,11 +56,38 @@ Fixes #38
 The format can be described more formally as follows:
 
 ```
-<subsystem>: <what changed>
+<package>: <what changed>
 <BLANK LINE>
 <why this change was made>
 <BLANK LINE>
 <footer>
 ```
 
-The first line is the subject and should be no longer than 70 characters, the second line is always blank, and other lines should be wrapped at 80 characters. This allows the message to be easier to read on GitHub as well as in various git tools.
+The first line is the subject and should be no longer than 70 characters, the second
+line is always blank, and other lines should be wrapped at 80 characters. This allows
+the message to be easier to read on GitHub as well as in various git tools.
+
+### Pull request across multiple files and packages
+
+If multiple files in a package are changed in a pull request for example:
+
+```
+etcdserver/config.go
+etcdserver/corrupt.go
+```
+
+At the end of the review process if multiple commits exist for a single package they
+should be squashed/rebased into a single commit before being merged.
+
+```
+etcdserver: <what changed>
+[..]
+```
+
+If a pull request spans many packages these commits should be squashed/rebased into a single
+commit using message with a more generic `*:` prefix.
+
+```
+*: <what changed>
+[..]
+```

Dockerfile-release

@@ -1,4 +1,4 @@
-FROM alpine:latest
+FROM k8s.gcr.io/debian-base:v1.0.0
 
 ADD etcd /usr/local/bin/
 ADD etcdctl /usr/local/bin/

Dockerfile-release.arm64

@@ -1,4 +1,4 @@
-FROM aarch64/ubuntu:16.04
+FROM k8s.gcr.io/debian-base-arm64:v1.0.0
 
 ADD etcd /usr/local/bin/
 ADD etcdctl /usr/local/bin/

Dockerfile-release.ppc64le

@@ -1,4 +1,4 @@
-FROM ppc64le/alpine:latest
+FROM k8s.gcr.io/debian-base-ppc64le:v1.0.0
 
 ADD etcd /usr/local/bin/
 ADD etcdctl /usr/local/bin/

Documentation/benchmarks/etcd-2-1-0-alpha-benchmarks.md

@@ -1,3 +1,7 @@
+---
+title: Benchmarking etcd v2.1.0
+---
+
 ## Physical machines
 
 GCE n1-highcpu-2 machine type

Documentation/benchmarks/etcd-2-2-0-benchmarks.md

@@ -1,4 +1,6 @@
-# Benchmarking etcd v2.2.0
+---
+title: Benchmarking etcd v2.2.0
+---
 
 ## Physical Machines
 

Documentation/benchmarks/etcd-2-2-0-rc-benchmarks.md

@@ -1,4 +1,8 @@
-## Physical machines
+---
+title: Benchmarking etcd v2.2.0-rc
+---
+
+## Physical machine
 
 GCE n1-highcpu-2 machine type
 

Documentation/benchmarks/etcd-2-2-0-rc-memory-benchmarks.md

@@ -1,3 +1,7 @@
+---
+title: Benchmarking etcd v2.2.0-rc-memory
+---
+
 ## Physical machine
 
 GCE n1-standard-2 machine type

Documentation/benchmarks/etcd-3-demo-benchmarks.md

@@ -1,3 +1,7 @@
+---
+title: Benchmarking etcd v3
+---
+
 ## Physical machines
 
 GCE n1-highcpu-2 machine type

Documentation/benchmarks/etcd-3-watch-memory-benchmark.md

@@ -1,4 +1,6 @@
-# Watch Memory Usage Benchmark
+---
+title: Watch Memory Usage Benchmark
+---
 
 *NOTE*: The watch features are under active development, and their memory usage may change as that development progresses. We do not expect it to significantly increase beyond the figures stated below.
 

Documentation/benchmarks/etcd-storage-memory-benchmark.md

@@ -1,4 +1,6 @@
-# Storage Memory Usage Benchmark
+---
+title: Storage Memory Usage Benchmark
+---
 
 <!---todo: link storage to storage design doc-->
 Two components of etcd storage consume physical memory. The etcd process allocates an *in-memory index* to speed key lookup. The process's *page cache*, managed by the operating system, stores recently-accessed data from disk for quick re-use.

Documentation/branch_management.md

@@ -1,4 +1,6 @@
-# Branch management
+---
+title: Branch management
+---
 
 ## Guide
 

Documentation/demo.md

@@ -1,4 +1,6 @@
-# Demo
+---
+title: Demo
+---
 
 This series of examples shows the basic procedures for working with an etcd cluster.
 
@@ -269,7 +271,10 @@ etcdctl --endpoints=$ENDPOINTS endpoint health
 
 <img src="https://storage.googleapis.com/etcd/demo/11_etcdctl_snapshot_2016051001.gif" alt="11_etcdctl_snapshot_2016051001"/>
 
+Snapshot can only be requested from one etcd node, so `--endpoints` flag should contain only one endpoint.
+
 ```
+ENDPOINTS=$HOST_1:2379
 etcdctl --endpoints=$ENDPOINTS snapshot save my.db
 
 Snapshot saved at my.db

Documentation/dev-guide/api_grpc_gateway.md

@@ -1,5 +1,6 @@
-
-## Why gRPC gateway
+---
+title: Why gRPC gateway
+---
 
 etcd v3 uses [gRPC][grpc] for its messaging protocol. The etcd project includes a gRPC-based [Go client][go-client] and a command line utility, [etcdctl][etcdctl], for communicating with an etcd cluster through gRPC. For languages with no gRPC support, etcd provides a JSON [gRPC gateway][grpc-gateway]. This gateway serves a RESTful proxy that translates HTTP/JSON requests into gRPC messages.
 
@@ -18,6 +19,8 @@ gRPC gateway endpoint has changed since etcd v3.3:
 - etcd v3.5 or later uses only `[CLIENT-URL]/v3/*`.
   - **`[CLIENT-URL]/v3beta/*` is deprecated**.
 
+gRPC-gateway does not support authentication using TLS Common Name.
+
 ### Put and get keys
 
 Use the `/v3/kv/range` and `/v3/kv/put` services to read and write keys:
@@ -48,7 +51,7 @@ curl -L http://localhost:2379/v3/kv/range \
 Use the `/v3/watch` service to watch keys:
 
 ```bash
-curl http://localhost:2379/v3/watch \
+curl -N http://localhost:2379/v3/watch \
   -X POST -d '{"create_request": {"key":"Zm9v"} }' &
 # {"result":{"header":{"cluster_id":"12585971608760269493","member_id":"13847567121247652255","revision":"1","raft_term":"2"},"created":true}}
 
@@ -62,12 +65,21 @@ curl -L http://localhost:2379/v3/kv/put \
 Issue a transaction with `/v3/kv/txn`:
 
 ```bash
+# target CREATE
 curl -L http://localhost:2379/v3/kv/txn \
   -X POST \
   -d '{"compare":[{"target":"CREATE","key":"Zm9v","createRevision":"2"}],"success":[{"requestPut":{"key":"Zm9v","value":"YmFy"}}]}'
 # {"header":{"cluster_id":"12585971608760269493","member_id":"13847567121247652255","revision":"3","raft_term":"2"},"succeeded":true,"responses":[{"response_put":{"header":{"revision":"3"}}}]}
 ```
 
+```bash
+# target VERSION
+curl -L http://localhost:2379/v3/kv/txn \
+  -X POST \
+  -d '{"compare":[{"version":"4","result":"EQUAL","target":"VERSION","key":"Zm9v"}],"success":[{"requestRange":{"key":"Zm9v"}}]}'
+# {"header":{"cluster_id":"14841639068965178418","member_id":"10276657743932975437","revision":"6","raft_term":"3"},"succeeded":true,"responses":[{"response_range":{"header":{"revision":"6"},"kvs":[{"key":"Zm9v","create_revision":"2","mod_revision":"6","version":"4","value":"YmF6"}],"count":"1"}}]}
+```
+
 ### Authentication
 
 Set up authentication with the `/v3/auth` service:
@@ -118,7 +130,7 @@ Generated [Swagger][swagger] API definitions can be found at [rpc.swagger.json][
 [api-ref]: ./api_reference_v3.md
 [go-client]: https://github.com/coreos/etcd/tree/master/clientv3
 [etcdctl]: https://github.com/coreos/etcd/tree/master/etcdctl
-[grpc]: http://www.grpc.io/
+[grpc]: https://www.grpc.io/
 [grpc-gateway]: https://github.com/grpc-ecosystem/grpc-gateway
 [json-mapping]: https://developers.google.com/protocol-buffers/docs/proto3#json
 [swagger]: http://swagger.io/

Documentation/dev-guide/api_reference_v3.md

@@ -11,14 +11,14 @@ This is a generated documentation. Please read the proto files for more.
 | AuthEnable | AuthEnableRequest | AuthEnableResponse | AuthEnable enables authentication. |
 | AuthDisable | AuthDisableRequest | AuthDisableResponse | AuthDisable disables authentication. |
 | Authenticate | AuthenticateRequest | AuthenticateResponse | Authenticate processes an authenticate request. |
-| UserAdd | AuthUserAddRequest | AuthUserAddResponse | UserAdd adds a new user. |
+| UserAdd | AuthUserAddRequest | AuthUserAddResponse | UserAdd adds a new user. User name cannot be empty. |
 | UserGet | AuthUserGetRequest | AuthUserGetResponse | UserGet gets detailed user information. |
 | UserList | AuthUserListRequest | AuthUserListResponse | UserList gets a list of all users. |
 | UserDelete | AuthUserDeleteRequest | AuthUserDeleteResponse | UserDelete deletes a specified user. |
 | UserChangePassword | AuthUserChangePasswordRequest | AuthUserChangePasswordResponse | UserChangePassword changes the password of a specified user. |
 | UserGrantRole | AuthUserGrantRoleRequest | AuthUserGrantRoleResponse | UserGrant grants a role to a specified user. |
 | UserRevokeRole | AuthUserRevokeRoleRequest | AuthUserRevokeRoleResponse | UserRevokeRole revokes a role of specified user. |
-| RoleAdd | AuthRoleAddRequest | AuthRoleAddResponse | RoleAdd adds a new role. |
+| RoleAdd | AuthRoleAddRequest | AuthRoleAddResponse | RoleAdd adds a new role. Role name cannot be empty. |
 | RoleGet | AuthRoleGetRequest | AuthRoleGetResponse | RoleGet gets detailed role information. |
 | RoleList | AuthRoleListRequest | AuthRoleListResponse | RoleList gets lists of all roles. |
 | RoleDelete | AuthRoleDeleteRequest | AuthRoleDeleteResponse | RoleDelete deletes a specified role. |
@@ -35,6 +35,7 @@ This is a generated documentation. Please read the proto files for more.
 | MemberRemove | MemberRemoveRequest | MemberRemoveResponse | MemberRemove removes an existing member from the cluster. |
 | MemberUpdate | MemberUpdateRequest | MemberUpdateResponse | MemberUpdate updates the member configuration. |
 | MemberList | MemberListRequest | MemberListResponse | MemberList lists all the members in the cluster. |
+| MemberPromote | MemberPromoteRequest | MemberPromoteResponse | MemberPromote promotes a member from raft learner (non-voting) to raft voting member. |
 
 
 
@@ -245,6 +246,7 @@ Empty field.
 | ----- | ----------- | ---- |
 | name |  | string |
 | password |  | string |
+| options |  | authpb.UserAddOptions |
 
 
 
@@ -607,6 +609,7 @@ Empty field.
 | name | name is the human-readable name of the member. If the member is not started, the name will be an empty string. | string |
 | peerURLs | peerURLs is the list of URLs the member exposes to the cluster for communication. | (slice of) string |
 | clientURLs | clientURLs is the list of URLs the member exposes to clients for communication. If the member is not started, clientURLs will be empty. | (slice of) string |
+| isLearner | isLearner indicates if the member is raft learner. | bool |
 
 
 
@@ -615,6 +618,7 @@ Empty field.
 | Field | Description | Type |
 | ----- | ----------- | ---- |
 | peerURLs | peerURLs is the list of URLs the added member will use to communicate with the cluster. | (slice of) string |
+| isLearner | isLearner indicates if the added member is raft learner. | bool |
 
 
 
@@ -643,6 +647,23 @@ Empty field.
 
 
 
+##### message `MemberPromoteRequest` (etcdserver/etcdserverpb/rpc.proto)
+
+| Field | Description | Type |
+| ----- | ----------- | ---- |
+| ID | ID is the member ID of the member to promote. | uint64 |
+
+
+
+##### message `MemberPromoteResponse` (etcdserver/etcdserverpb/rpc.proto)
+
+| Field | Description | Type |
+| ----- | ----------- | ---- |
+| header |  | ResponseHeader |
+| members | members is a list of all members after promoting the member. | (slice of) Member |
+
+
+
 ##### message `MemberRemoveRequest` (etcdserver/etcdserverpb/rpc.proto)
 
 | Field | Description | Type |
@@ -817,6 +838,7 @@ Empty field.
 | raftAppliedIndex | raftAppliedIndex is the current raft applied index of the responding member. | uint64 |
 | errors | errors contains alarm/health information and status. | (slice of) string |
 | dbSizeInUse | dbSizeInUse is the size of the backend database logically in use, in bytes, of the responding member. | int64 |
+| isLearner | isLearner indicates if the member is raft learner. | bool |
 
 
 
@@ -980,6 +1002,15 @@ User is a single entry in the bucket authUsers
 | name |  | bytes |
 | password |  | bytes |
 | roles |  | (slice of) string |
+| options |  | UserAddOptions |
+
+
+
+##### message `UserAddOptions` (auth/authpb/auth.proto)
+
+| Field | Description | Type |
+| ----- | ----------- | ---- |
+| no_password |  | bool |
 
 
 

Documentation/dev-guide/apispec/swagger/rpc.swagger.json

@@ -34,7 +34,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthenticateResponse"
             }
@@ -61,7 +61,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthDisableResponse"
             }
@@ -88,7 +88,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthEnableResponse"
             }
@@ -101,7 +101,7 @@
         "tags": [
           "Auth"
         ],
-        "summary": "RoleAdd adds a new role.",
+        "summary": "RoleAdd adds a new role. Role name cannot be empty.",
         "operationId": "RoleAdd",
         "parameters": [
           {
@@ -115,7 +115,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthRoleAddResponse"
             }
@@ -142,7 +142,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthRoleDeleteResponse"
             }
@@ -169,7 +169,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthRoleGetResponse"
             }
@@ -196,7 +196,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthRoleGrantPermissionResponse"
             }
@@ -223,7 +223,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthRoleListResponse"
             }
@@ -250,7 +250,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthRoleRevokePermissionResponse"
             }
@@ -263,7 +263,7 @@
         "tags": [
           "Auth"
         ],
-        "summary": "UserAdd adds a new user.",
+        "summary": "UserAdd adds a new user. User name cannot be empty.",
         "operationId": "UserAdd",
         "parameters": [
           {
@@ -277,7 +277,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthUserAddResponse"
             }
@@ -304,7 +304,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthUserChangePasswordResponse"
             }
@@ -331,7 +331,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthUserDeleteResponse"
             }
@@ -358,7 +358,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthUserGetResponse"
             }
@@ -385,7 +385,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthUserGrantRoleResponse"
             }
@@ -412,7 +412,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthUserListResponse"
             }
@@ -439,7 +439,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAuthUserRevokeRoleResponse"
             }
@@ -466,7 +466,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbMemberAddResponse"
             }
@@ -493,7 +493,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbMemberListResponse"
             }
@@ -501,6 +501,33 @@
         }
       }
     },
+    "/v3/cluster/member/promote": {
+      "post": {
+        "tags": [
+          "Cluster"
+        ],
+        "summary": "MemberPromote promotes a member from raft learner (non-voting) to raft voting member.",
+        "operationId": "MemberPromote",
+        "parameters": [
+          {
+            "name": "body",
+            "in": "body",
+            "required": true,
+            "schema": {
+              "$ref": "#/definitions/etcdserverpbMemberPromoteRequest"
+            }
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/etcdserverpbMemberPromoteResponse"
+            }
+          }
+        }
+      }
+    },
     "/v3/cluster/member/remove": {
       "post": {
         "tags": [
@@ -520,7 +547,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbMemberRemoveResponse"
             }
@@ -547,7 +574,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbMemberUpdateResponse"
             }
@@ -574,7 +601,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbCompactionResponse"
             }
@@ -601,7 +628,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbDeleteRangeResponse"
             }
@@ -628,7 +655,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbLeaseLeasesResponse"
             }
@@ -655,7 +682,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbLeaseRevokeResponse"
             }
@@ -682,7 +709,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbLeaseTimeToLiveResponse"
             }
@@ -709,7 +736,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbPutResponse"
             }
@@ -736,7 +763,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbRangeResponse"
             }
@@ -763,7 +790,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbTxnResponse"
             }
@@ -790,7 +817,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbLeaseGrantResponse"
             }
@@ -807,7 +834,7 @@
         "operationId": "LeaseKeepAlive",
         "parameters": [
           {
-            "description": "(streaming inputs)",
+            "description": " (streaming inputs)",
             "name": "body",
             "in": "body",
             "required": true,
@@ -818,9 +845,9 @@
         ],
         "responses": {
           "200": {
-            "description": "(streaming responses)",
+            "description": "A successful response.(streaming responses)",
             "schema": {
-              "$ref": "#/definitions/etcdserverpbLeaseKeepAliveResponse"
+              "$ref": "#/x-stream-definitions/etcdserverpbLeaseKeepAliveResponse"
             }
           }
         }
@@ -845,7 +872,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbLeaseLeasesResponse"
             }
@@ -872,7 +899,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbLeaseRevokeResponse"
             }
@@ -899,7 +926,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbLeaseTimeToLiveResponse"
             }
@@ -926,7 +953,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbAlarmResponse"
             }
@@ -953,7 +980,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbDefragmentResponse"
             }
@@ -980,7 +1007,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbHashKVResponse"
             }
@@ -1007,9 +1034,9 @@
         ],
         "responses": {
           "200": {
-            "description": "(streaming responses)",
+            "description": "A successful response.(streaming responses)",
             "schema": {
-              "$ref": "#/definitions/etcdserverpbSnapshotResponse"
+              "$ref": "#/x-stream-definitions/etcdserverpbSnapshotResponse"
             }
           }
         }
@@ -1034,7 +1061,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbStatusResponse"
             }
@@ -1061,7 +1088,7 @@
         ],
         "responses": {
           "200": {
-            "description": "(empty)",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/etcdserverpbMoveLeaderResponse"
             }
@@ -1078,7 +1105,7 @@
         "operationId": "Watch",
         "parameters": [
           {
-            "description": "(streaming inputs)",
+            "description": " (streaming inputs)",
             "name": "body",
             "in": "body",
             "required": true,
@@ -1089,9 +1116,9 @@
         ],
         "responses": {
           "200": {
-            "description": "(streaming responses)",
+            "description": "A successful response.(streaming responses)",
             "schema": {
-              "$ref": "#/definitions/etcdserverpbWatchResponse"
+              "$ref": "#/x-stream-definitions/etcdserverpbWatchResponse"
             }
           }
         }
@@ -1192,6 +1219,15 @@
         "READWRITE"
       ]
     },
+    "authpbUserAddOptions": {
+      "type": "object",
+      "properties": {
+        "no_password": {
+          "type": "boolean",
+          "format": "boolean"
+        }
+      }
+    },
     "etcdserverpbAlarmMember": {
       "type": "object",
       "properties": {
@@ -1393,6 +1429,9 @@
         "name": {
           "type": "string"
         },
+        "options": {
+          "$ref": "#/definitions/authpbUserAddOptions"
+        },
         "password": {
           "type": "string"
         }
@@ -1882,6 +1921,11 @@
             "type": "string"
           }
         },
+        "isLearner": {
+          "description": "isLearner indicates if the member is raft learner.",
+          "type": "boolean",
+          "format": "boolean"
+        },
         "name": {
           "description": "name is the human-readable name of the member. If the member is not started, the name will be an empty string.",
           "type": "string"
@@ -1898,6 +1942,11 @@
     "etcdserverpbMemberAddRequest": {
       "type": "object",
       "properties": {
+        "isLearner": {
+          "description": "isLearner indicates if the added member is raft learner.",
+          "type": "boolean",
+          "format": "boolean"
+        },
         "peerURLs": {
           "description": "peerURLs is the list of URLs the added member will use to communicate with the cluster.",
           "type": "array",
@@ -1944,6 +1993,31 @@
         }
       }
     },
+    "etcdserverpbMemberPromoteRequest": {
+      "type": "object",
+      "properties": {
+        "ID": {
+          "description": "ID is the member ID of the member to promote.",
+          "type": "string",
+          "format": "uint64"
+        }
+      }
+    },
+    "etcdserverpbMemberPromoteResponse": {
+      "type": "object",
+      "properties": {
+        "header": {
+          "$ref": "#/definitions/etcdserverpbResponseHeader"
+        },
+        "members": {
+          "description": "members is a list of all members after promoting the member.",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/etcdserverpbMember"
+          }
+        }
+      }
+    },
     "etcdserverpbMemberRemoveRequest": {
       "type": "object",
       "properties": {
@@ -2266,6 +2340,11 @@
         "header": {
           "$ref": "#/definitions/etcdserverpbResponseHeader"
         },
+        "isLearner": {
+          "description": "isLearner indicates if the member is raft learner.",
+          "type": "boolean",
+          "format": "boolean"
+        },
         "leader": {
           "description": "leader is the member ID which the responding member believes is the current leader.",
           "type": "string",
@@ -2508,6 +2587,43 @@
           "format": "int64"
         }
       }
+    },
+    "protobufAny": {
+      "type": "object",
+      "properties": {
+        "type_url": {
+          "type": "string"
+        },
+        "value": {
+          "type": "string",
+          "format": "byte"
+        }
+      }
+    },
+    "runtimeStreamError": {
+      "type": "object",
+      "properties": {
+        "details": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/protobufAny"
+          }
+        },
+        "grpc_code": {
+          "type": "integer",
+          "format": "int32"
+        },
+        "http_code": {
+          "type": "integer",
+          "format": "int32"
+        },
+        "http_status": {
+          "type": "string"
+        },
+        "message": {
+          "type": "string"
+        }
+      }
     }
   },
   "securityDefinitions": {
@@ -2521,5 +2637,43 @@
     {
       "ApiKey": []
     }
-  ]
+  ],
+  "x-stream-definitions": {
+    "etcdserverpbLeaseKeepAliveResponse": {
+      "properties": {
+        "error": {
+          "$ref": "#/definitions/runtimeStreamError"
+        },
+        "result": {
+          "$ref": "#/definitions/etcdserverpbLeaseKeepAliveResponse"
+        }
+      },
+      "title": "Stream result of etcdserverpbLeaseKeepAliveResponse",
+      "type": "object"
+    },
+    "etcdserverpbSnapshotResponse": {
+      "properties": {
+        "error": {
+          "$ref": "#/definitions/runtimeStreamError"
+        },
+        "result": {
+          "$ref": "#/definitions/etcdserverpbSnapshotResponse"
+        }
+      },
+      "title": "Stream result of etcdserverpbSnapshotResponse",
+      "type": "object"
+    },
+    "etcdserverpbWatchResponse": {
+      "properties": {
+        "error": {
+          "$ref": "#/definitions/runtimeStreamError"
+        },
+        "result": {
+          "$ref": "#/definitions/etcdserverpbWatchResponse"
+        }
+      },
+      "title": "Stream result of etcdserverpbWatchResponse",
+      "type": "object"
+    }
+  }
 }

Documentation/dev-guide/apispec/swagger/v3election.swagger.json

@@ -21,7 +21,7 @@
         "operationId": "Campaign",
         "responses": {
           "200": {
-            "description": "",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/v3electionpbCampaignResponse"
             }
@@ -48,7 +48,7 @@
         "operationId": "Leader",
         "responses": {
           "200": {
-            "description": "",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/v3electionpbLeaderResponse"
             }
@@ -75,9 +75,9 @@
         "operationId": "Observe",
         "responses": {
           "200": {
-            "description": "(streaming responses)",
+            "description": "A successful response.(streaming responses)",
             "schema": {
-              "$ref": "#/definitions/v3electionpbLeaderResponse"
+              "$ref": "#/x-stream-definitions/v3electionpbLeaderResponse"
             }
           }
         },
@@ -102,7 +102,7 @@
         "operationId": "Proclaim",
         "responses": {
           "200": {
-            "description": "",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/v3electionpbProclaimResponse"
             }
@@ -129,7 +129,7 @@
         "operationId": "Resign",
         "responses": {
           "200": {
-            "description": "",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/v3electionpbResignResponse"
             }
@@ -212,6 +212,43 @@
         }
       }
     },
+    "protobufAny": {
+      "type": "object",
+      "properties": {
+        "type_url": {
+          "type": "string"
+        },
+        "value": {
+          "type": "string",
+          "format": "byte"
+        }
+      }
+    },
+    "runtimeStreamError": {
+      "type": "object",
+      "properties": {
+        "grpc_code": {
+          "type": "integer",
+          "format": "int32"
+        },
+        "http_code": {
+          "type": "integer",
+          "format": "int32"
+        },
+        "message": {
+          "type": "string"
+        },
+        "http_status": {
+          "type": "string"
+        },
+        "details": {
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/protobufAny"
+          }
+        }
+      }
+    },
     "v3electionpbCampaignRequest": {
       "type": "object",
       "properties": {
@@ -330,5 +367,19 @@
         }
       }
     }
+  },
+  "x-stream-definitions": {
+    "v3electionpbLeaderResponse": {
+      "type": "object",
+      "properties": {
+        "result": {
+          "$ref": "#/definitions/v3electionpbLeaderResponse"
+        },
+        "error": {
+          "$ref": "#/definitions/runtimeStreamError"
+        }
+      },
+      "title": "Stream result of v3electionpbLeaderResponse"
+    }
   }
 }

Documentation/dev-guide/apispec/swagger/v3lock.swagger.json

@@ -21,7 +21,7 @@
         "operationId": "Lock",
         "responses": {
           "200": {
-            "description": "",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/v3lockpbLockResponse"
             }
@@ -48,7 +48,7 @@
         "operationId": "Unlock",
         "responses": {
           "200": {
-            "description": "",
+            "description": "A successful response.",
             "schema": {
               "$ref": "#/definitions/v3lockpbUnlockResponse"
             }

Documentation/dev-guide/experimental_apis.md

@@ -1,7 +1,9 @@
-# Experimental APIs and features
+---
+title: Experimental APIs and features
+---
 
 For the most part, the etcd project is stable, but we are still moving fast! We believe in the release fast philosophy. We want to get early feedback on features still in development and stabilizing. Thus, there are, and will be more, experimental features and APIs. We plan to improve these features based on the early feedback from the community, or abandon them if there is little interest, in the next few releases. Please do not rely on any experimental features or APIs in production environment.
 
 ## The current experimental API/features are:
 
-- [KV ordering](https://godoc.org/github.com/coreos/etcd/clientv3/ordering) wrapper. When an etcd client switches endpoints, responses to serializable reads may go backward in time if the new endpoint is lagging behind the rest of the cluster. The ordering wrapper caches the current cluster revision from response headers. If a response revision is less than the cached revision, the client selects another endpoint and reissues the read. Enable in grpcproxy with `--experimental-serializable-ordering`.
+- [KV ordering](https://godoc.org/github.com/etcd-io/etcd/clientv3/ordering) wrapper. When an etcd client switches endpoints, responses to serializable reads may go backward in time if the new endpoint is lagging behind the rest of the cluster. The ordering wrapper caches the current cluster revision from response headers. If a response revision is less than the cached revision, the client selects another endpoint and reissues the read. Enable in grpcproxy with `--experimental-serializable-ordering`.

Documentation/dev-guide/grpc_naming.md

@@ -1,4 +1,6 @@
-# gRPC naming and discovery
+---
+title: gRPC naming and discovery
+---
 
 etcd provides a gRPC resolver to support an alternative name system that fetches endpoints from etcd for discovering gRPC services. The underlying mechanism is based on watching updates to keys prefixed with the service name.
 
@@ -8,8 +10,8 @@ The etcd client provides a gRPC resolver for resolving gRPC endpoints with an et
 
 ```go
 import (
-	"github.com/coreos/etcd/clientv3"
-	etcdnaming "github.com/coreos/etcd/clientv3/naming"
+	"go.etcd.io/etcd/clientv3"
+	etcdnaming "go.etcd.io/etcd/clientv3/naming"
 
 	"google.golang.org/grpc"
 )

Documentation/dev-guide/interacting_v3.md

@@ -1,8 +1,12 @@
-# Interacting with etcd
+---
+title: Interacting with etcd
+---
 
 Users mostly interact with etcd by putting or getting the value of a key. This section describes how to do that by using etcdctl, a command line tool for interacting with etcd server. The concepts described here should apply to the gRPC APIs or client library APIs.
 
-By default, etcdctl talks to the etcd server with the v2 API for backward compatibility. For etcdctl to speak to etcd using the v3 API, the API version must be set to version 3 via the `ETCDCTL_API` environment variable. However note that any key that was created using the v2 API will not be able to be queried via the v3 API.  A v3 API ```etcdctl get``` of a v2 key will exit with 0 and no key data, this is the expected behaviour.
+The API version used by etcdctl to speak to etcd may be set to version `2` or `3` via the `ETCDCTL_API` environment variable. By default, etcdctl on master (3.4) uses the v3 API and earlier versions (3.3 and earlier) default to the v2 API.
+
+Note that any key that was created using the v2 API will not be able to be queried via the v3 API.  A v3 API ```etcdctl get``` of a v2 key will exit with 0 and no key data, this is the expected behaviour.
 
 
 ```bash

Documentation/dev-guide/limit.md

@@ -1,4 +1,6 @@
-# System limits
+---
+title: System limits
+---
 
 ## Request size limit
 

Documentation/dev-guide/local_cluster.md

@@ -1,4 +1,6 @@
-# Set up a local cluster
+---
+title: Set up a local cluster
+---
 
 For testing and development deployments, the quickest and easiest way is to configure a local cluster. For a production deployment, refer to the [clustering][clustering] section.
 
@@ -21,14 +23,7 @@ The running etcd member listens on `localhost:2379` for client requests.
 
 Use `etcdctl` to interact with the running cluster:
 
-1. Configure the environment to have `ETCDCTL_API=3` so `etcdctl` uses the etcd API version 3 instead of defaulting to version 2.
-
-    ```
-    # use API version 3
-    $ export ETCDCTL_API=3
-    ```
-
-2. Store an example key-value pair in the cluster:
+1. Store an example key-value pair in the cluster:
 
     ```
       $ ./etcdctl put foo bar
@@ -37,7 +32,7 @@ Use `etcdctl` to interact with the running cluster:
 
     If OK is printed, storing key-value pair is successful.
 
-3. Retrieve the value of `foo`:
+2. Retrieve the value of `foo`:
 
     ```
     $ ./etcdctl get foo
@@ -70,14 +65,7 @@ A `Procfile` at the base of the etcd git repository is provided to easily config
 
 Use `etcdctl` to interact with the running cluster:
 
-1. Configure the environment to have `ETCDCTL_API=3` so `etcdctl` uses the etcd API version 3 instead of defaulting to version 2.
-
-    ```
-    # use API version 3
-    $ export ETCDCTL_API=3
-    ```
-
-2. Print the list of members:
+1. Print the list of members:
 
     ```
     $ etcdctl --write-out=table --endpoints=localhost:2379 member list
@@ -94,7 +82,7 @@ Use `etcdctl` to interact with the running cluster:
     +------------------+---------+--------+------------------------+------------------------+
     ```
 
-3. Store an example key-value pair in the cluster:
+2. Store an example key-value pair in the cluster:
 
     ```
     $ etcdctl put foo bar

Documentation/dev-internal/discovery_protocol.md

@@ -1,4 +1,6 @@
-# Discovery service protocol
+---
+title: Discovery service protocol
+---
 
 Discovery service protocol helps new etcd member to discover all other members in cluster bootstrap phase using a shared discovery URL.
 

Documentation/dev-internal/logging.md

@@ -1,4 +1,6 @@
-# Logging conventions
+---
+title: Logging conventions
+---
 
 etcd uses the [capnslog][capnslog] library for logging application output categorized into *levels*. A log message's level is determined according to these conventions:
 

Documentation/dev-internal/release.md

@@ -1,4 +1,6 @@
-# etcd release guide
+---
+title: etcd release guide
+---
 
 The guide talks about how to release a new version of etcd.
 
@@ -12,6 +14,7 @@ release and for ensuring the stability of the release branch.
 
 | Releases | Manager |
 | -------- | ------- |
+| 3.1 patch (post 3.1.0) | Joe Betz [@jpbetz](https://github.com/jpbetz) |
 | 3.2 patch (post 3.2.0) | Joe Betz [@jpbetz](https://github.com/jpbetz) |
 | 3.3 patch (post 3.3.0) | Gyuho Lee [@gyuho](https://github.com/gyuho) |
 
@@ -29,9 +32,9 @@ All releases version numbers follow the format of [semantic versioning 2.0.0](ht
 ### Major, minor version release, or its pre-release
 
 - Ensure the relevant milestone on GitHub is complete. All referenced issues should be closed, or moved elsewhere.
-- Remove this release from [roadmap](https://github.com/coreos/etcd/blob/master/ROADMAP.md), if necessary.
+- Remove this release from [roadmap](https://github.com/etcd-io/etcd/blob/master/ROADMAP.md), if necessary.
 - Ensure the latest upgrade documentation is available.
-- Bump [hardcoded MinClusterVerion in the repository](https://github.com/coreos/etcd/blob/master/version/version.go#L29), if necessary.
+- Bump [hardcoded MinClusterVerion in the repository](https://github.com/etcd-io/etcd/blob/master/version/version.go#L29), if necessary.
 - Add feature capability maps for the new version, if necessary.
 
 ### Patch version release
@@ -49,18 +52,17 @@ All releases version numbers follow the format of [semantic versioning 2.0.0](ht
 
 ## Tag version
 
-- Bump [hardcoded Version in the repository](https://github.com/coreos/etcd/blob/master/version/version.go#L30) to the latest version `${VERSION}`.
+- Bump [hardcoded Version in the repository](https://github.com/etcd-io/etcd/blob/master/version/version.go#L30) to the latest version `${VERSION}`.
 - Ensure all tests on CI system are passed.
 - Manually check etcd is buildable in Linux, Darwin and Windows.
 - Manually check upgrade etcd cluster of previous minor version works well.
 - Manually check new features work well.
 - Add a signed tag through `git tag -s ${VERSION}`.
 - Sanity check tag correctness through `git show tags/$VERSION`.
-- Push the tag to GitHub through `git push origin tags/$VERSION`. This assumes `origin` corresponds to "https://github.com/coreos/etcd".
+- Push the tag to GitHub through `git push origin tags/$VERSION`. This assumes `origin` corresponds to "https://github.com/etcd-io/etcd".
 
 ## Build release binaries and images
 
-- Ensure `acbuild` is available.
 - Ensure `docker` is available.
 
 Run release script in root directory:
@@ -83,11 +85,11 @@ for i in etcd-*{.zip,.tar.gz}; do gpg2 --default-key $SUBKEYID --armor --output
 for i in etcd-*{.zip,.tar.gz}; do gpg2 --verify ${i}.asc ${i}; done
 
 # sign zipped source code files
-wget https://github.com/coreos/etcd/archive/${VERSION}.zip
+wget https://github.com/etcd-io/etcd/archive/${VERSION}.zip
 gpg2 --armor --default-key $SUBKEYID --output ${VERSION}.zip.asc --detach-sign ${VERSION}.zip
 gpg2 --verify ${VERSION}.zip.asc ${VERSION}.zip
 
-wget https://github.com/coreos/etcd/archive/${VERSION}.tar.gz
+wget https://github.com/etcd-io/etcd/archive/${VERSION}.tar.gz
 gpg2 --armor --default-key $SUBKEYID --output ${VERSION}.tar.gz.asc --detach-sign ${VERSION}.tar.gz
 gpg2 --verify ${VERSION}.tar.gz.asc ${VERSION}.tar.gz
 ```
@@ -155,5 +157,5 @@ git log ...${PREV_VERSION} --pretty=format:"%an" | sort | uniq | tr '\n' ',' | s
 
 ## Post release
 
-- Create new stable branch through `git push origin ${VERSION_MAJOR}.${VERSION_MINOR}` if this is a major stable release. This assumes `origin` corresponds to "https://github.com/coreos/etcd".
-- Bump [hardcoded Version in the repository](https://github.com/coreos/etcd/blob/master/version/version.go#L30) to the version `${VERSION}+git`.
+- Create new stable branch through `git push origin ${VERSION_MAJOR}.${VERSION_MINOR}` if this is a major stable release. This assumes `origin` corresponds to "https://github.com/etcd-io/etcd".
+- Bump [hardcoded Version in the repository](https://github.com/etcd-io/etcd/blob/master/version/version.go#L30) to the version `${VERSION}+git`.

Documentation/dl_build.md

@@ -1,4 +1,6 @@
-# Download and build
+---
+title: Download and build
+---
 
 ## System requirements
 
@@ -15,7 +17,7 @@ For those wanting to try the very latest version, build etcd from the `master` b
 To build `etcd` from the `master` branch without a `GOPATH` using the official `build` script:
 
 ```sh
-$ git clone https://github.com/coreos/etcd.git
+$ git clone https://github.com/etcd-io/etcd.git
 $ cd etcd
 $ ./build
 ```
@@ -26,7 +28,8 @@ To build a vendored `etcd` from the `master` branch via `go get`:
 # GOPATH should be set
 $ echo $GOPATH
 /Users/example/go
-$ go get -v github.com/coreos/etcd
+$ go get -v go.etcd.io/etcd
+$ go get -v go.etcd.io/etcd/etcdctl
 ```
 
 ## Test the installation
@@ -35,14 +38,14 @@ Check the etcd binary is built correctly by starting etcd and setting a key.
 
 ### Starting etcd
 
-If etcd is built without using GOPATH, run the following:
+If etcd is built without using `go get`, run the following:
 
-```
+```sh
 $ ./bin/etcd
 ```
-If etcd is built using GOPATH, run the following:
+If etcd is built using `go get`, run the following:
 
-```
+```sh
 $ $GOPATH/bin/etcd
 ```
 
@@ -50,14 +53,16 @@ $ $GOPATH/bin/etcd
 
 Run the following:
 
-```
-$ ETCDCTL_API=3 ./bin/etcdctl put foo bar
+```sh
+$ ./bin/etcdctl put foo bar
 OK
 ```
 
+(or `$GOPATH/bin/etcdctl put foo bar` if etcdctl was installed with `go get`)
+
 If OK is printed, then etcd is working!
 
-[github-release]: https://github.com/coreos/etcd/releases/
+[github-release]: https://github.com/etcd-io/etcd/releases/
 [go]: https://golang.org/doc/install
 [build-script]: ../build
 [cmd-directory]: ../cmd

Documentation/docs.md

@@ -68,8 +68,10 @@ To learn more about the concepts and internals behind etcd, read the following p
  - [Understand data model][data_model]
  - [Understand APIs][understand_apis]
  - [Glossary][glossary]
- - Internals
-   - [Auth subsystem][auth_design]
+ - Design
+   - [Auth subsystem][design-auth-v3]
+   - [Client][design-client]
+   - [Learner][design-learner]
 
 [api_ref]: dev-guide/api_reference_v3.md
 [api_concurrency_ref]: dev-guide/api_concurrency_reference_v3.md
@@ -82,12 +84,12 @@ To learn more about the concepts and internals behind etcd, read the following p
 [data_model]: learning/data_model.md
 [demo]: demo.md
 [download_build]: dl_build.md
-[embed_etcd]: https://godoc.org/github.com/coreos/etcd/embed
+[embed_etcd]: https://godoc.org/github.com/etcd-io/etcd/embed
 [grpc_naming]: dev-guide/grpc_naming.md
 [failures]: op-guide/failures.md
 [gateway]: op-guide/gateway.md
 [glossary]: learning/glossary.md
-[namespace_client]: https://godoc.org/github.com/coreos/etcd/clientv3/namespace
+[namespace_client]: https://godoc.org/github.com/etcd-io/etcd/clientv3/namespace
 [namespace_proxy]: op-guide/grpc_proxy.md#namespacing
 [grpc_proxy]: op-guide/grpc_proxy.md
 [hardware]: op-guide/hardware.md
@@ -109,6 +111,8 @@ To learn more about the concepts and internals behind etcd, read the following p
 [aws_platform]: platforms/aws.md
 [experimental]: dev-guide/experimental_apis.md
 [authentication]: op-guide/authentication.md
-[auth_design]: learning/auth_design.md
+[design-auth-v3]: learning/design-auth-v3.md
+[design-client]: learning/design-client.md
+[design-learner]: learning/design-learner.md
 [tuning]: tuning.md
 [upgrading]: upgrades/upgrading-etcd.md

Documentation/etcd-mixin/README.md

@@ -9,3 +9,17 @@ Instructions for use are the same as the [kubernetes-mixin](https://github.com/k
 ## Background
 
 * For more information about monitoring mixins, see this [design doc](https://docs.google.com/document/d/1A9xvzwqnFVSOZ5fD3blKODXfsat5fg6ZhnKu9LK3lB4/edit#).
+
+## Testing alerts
+
+Make sure to have [jsonnet](https://jsonnet.org/) and [gojsontoyaml](https://github.com/brancz/gojsontoyaml) installed.
+
+First compile the mixin to a YAML file, which the promtool will read:
+```
+jsonnet -e '(import "mixin.libsonnet").prometheusAlerts' | gojsontoyaml > mixin.yaml
+```
+
+Then run the unit test:
+```
+promtool test rules test.yaml
+```

Documentation/etcd-mixin/mixin.libsonnet

@@ -9,20 +9,40 @@
         name: 'etcd',
         rules: [
           {
-            alert: 'EtcdInsufficientMembers',
+            alert: 'etcdMembersDown',
             expr: |||
-              count(up{%(etcd_selector)s} == 0) by (job) > (count(up{%(etcd_selector)s}) by (job) / 2 - 1)
+              max by (job) (
+                sum by (job) (up{%(etcd_selector)s} == bool 0)
+              or
+                count by (job,endpoint) (
+                  sum by (job,endpoint,To) (rate(etcd_network_peer_sent_failures_total{%(etcd_selector)s}[3m])) > 0.01
+                )
+              )
+              > 0
             ||| % $._config,
             'for': '3m',
             labels: {
               severity: 'critical',
             },
             annotations: {
-              message: 'Etcd cluster "{{ $labels.job }}": insufficient members ({{ $value }}).',
+              message: 'etcd cluster "{{ $labels.job }}": members are down ({{ $value }}).',
             },
           },
           {
-            alert: 'EtcdNoLeader',
+            alert: 'etcdInsufficientMembers',
+            expr: |||
+              sum(up{%(etcd_selector)s} == bool 1) by (job) < ((count(up{%(etcd_selector)s}) by (job) + 1) / 2)
+            ||| % $._config,
+            'for': '3m',
+            labels: {
+              severity: 'critical',
+            },
+            annotations: {
+              message: 'etcd cluster "{{ $labels.job }}": insufficient members ({{ $value }}).',
+            },
+          },
+          {
+            alert: 'etcdNoLeader',
             expr: |||
               etcd_server_has_leader{%(etcd_selector)s} == 0
             ||| % $._config,
@@ -31,11 +51,11 @@
               severity: 'critical',
             },
             annotations: {
-              message: 'Etcd cluster "{{ $labels.job }}": member {{ $labels.instance }} has no leader.',
+              message: 'etcd cluster "{{ $labels.job }}": member {{ $labels.instance }} has no leader.',
             },
           },
           {
-            alert: 'EtcdHighNumberOfLeaderChanges',
+            alert: 'etcdHighNumberOfLeaderChanges',
             expr: |||
               rate(etcd_server_leader_changes_seen_total{%(etcd_selector)s}[15m]) > 3
             ||| % $._config,
@@ -44,11 +64,11 @@
               severity: 'warning',
             },
             annotations: {
-              message: 'Etcd cluster "{{ $labels.job }}": instance {{ $labels.instance }} has seen {{ $value }} leader changes within the last hour.',
+              message: 'etcd cluster "{{ $labels.job }}": instance {{ $labels.instance }} has seen {{ $value }} leader changes within the last 30 minutes.',
             },
           },
           {
-            alert: 'EtcdHighNumberOfFailedGRPCRequests',
+            alert: 'etcdHighNumberOfFailedGRPCRequests',
             expr: |||
               100 * sum(rate(grpc_server_handled_total{%(etcd_selector)s, grpc_code!="OK"}[5m])) BY (job, instance, grpc_service, grpc_method)
                 /
@@ -60,11 +80,11 @@
               severity: 'warning',
             },
             annotations: {
-              message: 'Etcd cluster "{{ $labels.job }}": {{ $value }}% of requests for {{ $labels.grpc_method }} failed on etcd instance {{ $labels.instance }}.',
+              message: 'etcd cluster "{{ $labels.job }}": {{ $value }}% of requests for {{ $labels.grpc_method }} failed on etcd instance {{ $labels.instance }}.',
             },
           },
           {
-            alert: 'EtcdHighNumberOfFailedGRPCRequests',
+            alert: 'etcdHighNumberOfFailedGRPCRequests',
             expr: |||
               100 * sum(rate(grpc_server_handled_total{%(etcd_selector)s, grpc_code!="OK"}[5m])) BY (job, instance, grpc_service, grpc_method)
                 /
@@ -76,11 +96,11 @@
               severity: 'critical',
             },
             annotations: {
-              message: 'Etcd cluster "{{ $labels.job }}": {{ $value }}% of requests for {{ $labels.grpc_method }} failed on etcd instance {{ $labels.instance }}.',
+              message: 'etcd cluster "{{ $labels.job }}": {{ $value }}% of requests for {{ $labels.grpc_method }} failed on etcd instance {{ $labels.instance }}.',
             },
           },
           {
-            alert: 'EtcdGRPCRequestsSlow',
+            alert: 'etcdGRPCRequestsSlow',
             expr: |||
               histogram_quantile(0.99, sum(rate(grpc_server_handling_seconds_bucket{%(etcd_selector)s, grpc_type="unary"}[5m])) by (job, instance, grpc_service, grpc_method, le))
               > 0.15
@@ -90,11 +110,11 @@
               severity: 'critical',
             },
             annotations: {
-              message: 'Etcd cluster "{{ $labels.job }}": gRPC requests to {{ $labels.grpc_method }} are taking {{ $value }}s on etcd instance {{ $labels.instance }}.',
+              message: 'etcd cluster "{{ $labels.job }}": gRPC requests to {{ $labels.grpc_method }} are taking {{ $value }}s on etcd instance {{ $labels.instance }}.',
             },
           },
           {
-            alert: 'EtcdMemberCommunicationSlow',
+            alert: 'etcdMemberCommunicationSlow',
             expr: |||
               histogram_quantile(0.99, rate(etcd_network_peer_round_trip_time_seconds_bucket{%(etcd_selector)s}[5m]))
               > 0.15
@@ -104,11 +124,11 @@
               severity: 'warning',
             },
             annotations: {
-              message: 'Etcd cluster "{{ $labels.job }}": member communication with {{ $labels.To }} is taking {{ $value }}s on etcd instance {{ $labels.instance }}.',
+              message: 'etcd cluster "{{ $labels.job }}": member communication with {{ $labels.To }} is taking {{ $value }}s on etcd instance {{ $labels.instance }}.',
             },
           },
           {
-            alert: 'EtcdHighNumberOfFailedProposals',
+            alert: 'etcdHighNumberOfFailedProposals',
             expr: |||
               rate(etcd_server_proposals_failed_total{%(etcd_selector)s}[15m]) > 5
             ||| % $._config,
@@ -117,11 +137,11 @@
               severity: 'warning',
             },
             annotations: {
-              message: 'Etcd cluster "{{ $labels.job }}": {{ $value }} proposal failures within the last hour on etcd instance {{ $labels.instance }}.',
+              message: 'etcd cluster "{{ $labels.job }}": {{ $value }} proposal failures within the last 30 minutes on etcd instance {{ $labels.instance }}.',
             },
           },
           {
-            alert: 'EtcdHighFsyncDurations',
+            alert: 'etcdHighFsyncDurations',
             expr: |||
               histogram_quantile(0.99, rate(etcd_disk_wal_fsync_duration_seconds_bucket{%(etcd_selector)s}[5m]))
               > 0.5
@@ -131,11 +151,11 @@
               severity: 'warning',
             },
             annotations: {
-              message: 'Etcd cluster "{{ $labels.job }}": 99th percentile fync durations are {{ $value }}s on etcd instance {{ $labels.instance }}.',
+              message: 'etcd cluster "{{ $labels.job }}": 99th percentile fync durations are {{ $value }}s on etcd instance {{ $labels.instance }}.',
             },
           },
           {
-            alert: 'EtcdHighCommitDurations',
+            alert: 'etcdHighCommitDurations',
             expr: |||
               histogram_quantile(0.99, rate(etcd_disk_backend_commit_duration_seconds_bucket{%(etcd_selector)s}[5m]))
               > 0.25
@@ -145,37 +165,49 @@
               severity: 'warning',
             },
             annotations: {
-              message: 'Etcd cluster "{{ $labels.job }}": 99th percentile commit durations {{ $value }}s on etcd instance {{ $labels.instance }}.',
+              message: 'etcd cluster "{{ $labels.job }}": 99th percentile commit durations {{ $value }}s on etcd instance {{ $labels.instance }}.',
             },
           },
           {
-            record: 'instance:fd_utilization',
-            expr: 'process_open_fds / process_max_fds',
-          },
-          {
-            alert: 'FdExhaustionClose',
+            alert: 'etcdHighNumberOfFailedHTTPRequests',
             expr: |||
-              predict_linear(instance:fd_utilization{%(etcd_selector)s}[1h], 3600 * 4) > 1
+              sum(rate(etcd_http_failed_total{%(etcd_selector)s, code!="404"}[5m])) BY (method) / sum(rate(etcd_http_received_total{%(etcd_selector)s}[5m]))
+              BY (method) > 0.01
             ||| % $._config,
             'for': '10m',
             labels: {
               severity: 'warning',
             },
             annotations: {
-              message: '{{ $labels.job }} instance {{ $labels.instance }} will exhaust its file descriptors soon',
+              message: '{{ $value }}% of requests for {{ $labels.method }} failed on etcd instance {{ $labels.instance }}',
             },
           },
           {
-            alert: 'FdExhaustionClose',
+            alert: 'etcdHighNumberOfFailedHTTPRequests',
             expr: |||
-              predict_linear(instance:fd_utilization{%(etcd_selector)s}[10m], 3600) > 1
+              sum(rate(etcd_http_failed_total{%(etcd_selector)s, code!="404"}[5m])) BY (method) / sum(rate(etcd_http_received_total{%(etcd_selector)s}[5m]))
+              BY (method) > 0.05
             ||| % $._config,
             'for': '10m',
             labels: {
               severity: 'critical',
             },
             annotations: {
-              description: '{{ $labels.job }} instance {{ $labels.instance }} will exhaust its file descriptors soon',
+              message: '{{ $value }}% of requests for {{ $labels.method }} failed on etcd instance {{ $labels.instance }}.',
+            },
+          },
+          {
+            alert: 'etcdHTTPRequestsSlow',
+            expr: |||
+              histogram_quantile(0.99, rate(etcd_http_successful_duration_seconds_bucket[5m]))
+              > 0.15
+            ||| % $._config,
+            'for': '10m',
+            labels: {
+              severity: 'warning',
+            },
+            annotations: {
+              message: 'etcd instance {{ $labels.instance }} HTTP requests to {{ $labels.method }} are slow.',
             },
           },
         ],
@@ -1251,7 +1283,7 @@
       annotations: {
         list: [],
       },
-      refresh: false,
+      refresh: '10s',
       schemaVersion: 13,
       version: 215,
       links: [],

Documentation/etcd-mixin/test.yaml

@@ -0,0 +1,85 @@
+rule_files:
+  - mixin.yaml
+
+evaluation_interval: 1m
+
+tests:
+  - interval: 1m
+    input_series:
+      - series: 'up{job="etcd",instance="10.10.10.0"}'
+        values: '1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0'
+      - series: 'up{job="etcd",instance="10.10.10.1"}'
+        values: '1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0'
+      - series: 'up{job="etcd",instance="10.10.10.2"}'
+        values: '1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0'
+    alert_rule_test:
+      - eval_time: 3m
+        alertname: etcdInsufficientMembers
+      - eval_time: 5m
+        alertname: etcdInsufficientMembers
+      - eval_time: 5m
+        alertname: etcdMembersDown
+      - eval_time: 7m
+        alertname: etcdMembersDown
+        exp_alerts:
+          - exp_labels:
+              job: etcd
+              severity: critical
+            exp_annotations:
+              message: 'etcd cluster "etcd": members are down (1).'
+      - eval_time: 7m
+        alertname: etcdInsufficientMembers
+      - eval_time: 11m
+        alertname: etcdInsufficientMembers
+        exp_alerts:
+          - exp_labels:
+              job: etcd
+              severity: critical
+            exp_annotations:
+              message: 'etcd cluster "etcd": insufficient members (1).'
+      - eval_time: 15m
+        alertname: etcdInsufficientMembers
+        exp_alerts:
+          - exp_labels:
+              job: etcd
+              severity: critical
+            exp_annotations:
+              message: 'etcd cluster "etcd": insufficient members (0).'
+
+  - interval: 1m
+    input_series:
+      - series: 'up{job="etcd",instance="10.10.10.0"}'
+        values: '1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0'
+      - series: 'up{job="etcd",instance="10.10.10.1"}'
+        values: '1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0'
+      - series: 'up{job="etcd",instance="10.10.10.2"}'
+        values: '1 1 1 1 0 0 0 0'
+    alert_rule_test:
+      - eval_time: 10m
+        alertname: etcdMembersDown
+        exp_alerts:
+          - exp_labels:
+              job: etcd
+              severity: critical
+            exp_annotations:
+              message: 'etcd cluster "etcd": members are down (2).'
+
+  - interval: 1m
+    input_series:
+      - series: 'up{job="etcd",instance="10.10.10.0"}'
+        values: '1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0'
+      - series: 'up{job="etcd",instance="10.10.10.1"}'
+        values: '1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0'
+      - series: 'etcd_network_peer_sent_failures_total{To="member-1",job="etcd",endpoint="test"}'
+        values: '0 0 1 2 3 4 5 6 7 8 9 10'
+    alert_rule_test:
+      - eval_time: 4m
+        alertname: etcdMembersDown
+      - eval_time: 6m
+        alertname: etcdMembersDown
+        exp_alerts:
+          - exp_labels:
+              job: etcd
+              severity: critical
+            exp_annotations:
+              message: 'etcd cluster "etcd": members are down (1).'

Documentation/faq.md

@@ -1,4 +1,6 @@
-# Frequently Asked Questions (FAQ)
+---
+title: Frequently Asked Questions (FAQ)
+---
 
 ## etcd, general
 
@@ -22,7 +24,7 @@ A member's advertised peer URLs come from `--initial-advertise-peer-urls` on ini
 
 ### System requirements
 
-Since etcd writes data to disk, SSD is highly recommended. To prevent performance degradation or unintentionally overloading the key-value store, etcd enforces a configurable storage size quota set to 2GB by default. To avoid swapping or running out of memory, the machine should have at least as much RAM to cover the quota. 8GB is a suggested maximum size for normal environments and etcd warns at startup if the configured value exceeds it. At CoreOS, an etcd cluster is usually deployed on dedicated CoreOS Container Linux machines with dual-core processors, 2GB of RAM, and 80GB of SSD *at the very least*. **Note that performance is intrinsically workload dependent; please test before production deployment**. See [hardware][hardware-setup] for more recommendations.
+Since etcd writes data to disk, its performance strongly depends on disk performance. For this reason, SSD is highly recommended. To assess whether a disk is fast enough for etcd, one possibility is using a disk benchmarking tool such as [fio][fio]. For an example on how to do that, read [here][fio-blog-post]. To prevent performance degradation or unintentionally overloading the key-value store, etcd enforces a configurable storage size quota set to 2GB by default. To avoid swapping or running out of memory, the machine should have at least as much RAM to cover the quota. 8GB is a suggested maximum size for normal environments and etcd warns at startup if the configured value exceeds it. At CoreOS, an etcd cluster is usually deployed on dedicated CoreOS Container Linux machines with dual-core processors, 2GB of RAM, and 80GB of SSD *at the very least*. **Note that performance is intrinsically workload dependent; please test before production deployment**. See [hardware][hardware-setup] for more recommendations.
 
 Most stable production environment is Linux operating system with amd64 architecture; see [supported platform][supported-platform] for more.
 
@@ -70,7 +72,7 @@ etcdctl provides a `snapshot` command to create backups. See [backup][backup] fo
 
 When replacing an etcd node, it's important  to remove the member first and then add its replacement.
 
-etcd employs distributed consensus based on a quorum model; (n+1)/2 members, a majority, must agree on a proposal before it can be committed to the cluster. These proposals include key-value updates and membership changes. This model totally avoids any possibility of split brain inconsistency. The downside is permanent quorum loss is catastrophic.
+etcd employs distributed consensus based on a quorum model; (n/2)+1 members, a majority, must agree on a proposal before it can be committed to the cluster. These proposals include key-value updates and membership changes. This model totally avoids any possibility of split brain inconsistency. The downside is permanent quorum loss is catastrophic.
 
 How this applies to membership: If a 3-member cluster has 1 downed member, it can still make forward progress because the quorum is 2 and 2 members are still live. However, adding a new member to a 3-member cluster will increase the quorum to 3 because 3 votes are required for a majority of 4 members. Since the quorum increased, this extra member buys nothing in terms of fault tolerance; the cluster is still one node failure away from being unrecoverable.
 
@@ -106,7 +108,7 @@ To recover from the low space quota alarm:
 
 This is gRPC-side warning when a server receives a TCP RST flag with client-side streams being prematurely closed. For example, a client closes its connection, while gRPC server has not yet processed all HTTP/2 frames in the TCP queue. Some data may have been lost in server side, but it is ok so long as client connection has already been closed.
 
-Only [old versions of gRPC](https://github.com/grpc/grpc-go/issues/1362) log this. etcd [>=v3.2.13 by default log this with DEBUG level](https://github.com/coreos/etcd/pull/9080), thus only visible with `--debug` flag enabled.
+Only [old versions of gRPC](https://github.com/grpc/grpc-go/issues/1362) log this. etcd [>=v3.2.13 by default log this with DEBUG level](https://github.com/etcd-io/etcd/pull/9080), thus only visible with `--debug` flag enabled.
 
 ## Performance
 
@@ -130,7 +132,7 @@ If none of the above suggestions clear the warnings, please [open an issue][new_
 
 etcd uses a leader-based consensus protocol for consistent data replication and log execution. Cluster members elect a single leader, all other members become followers. The elected leader must periodically send heartbeats to its followers to maintain its leadership. Followers infer leader failure if no heartbeats are received within an election interval and trigger an election. If a leader doesn’t send its heartbeats in time but is still running, the election is spurious and likely caused by insufficient resources. To catch these soft failures, if the leader skips two heartbeat intervals, etcd will warn it failed to send a heartbeat on time.
 
-Usually this issue is caused by a slow disk. Before the leader sends heartbeats attached with metadata, it may need to persist the metadata to disk. The disk could be experiencing contention among etcd and other applications, or the disk is too simply slow (e.g., a shared virtualized disk). To rule out a slow disk from causing this warning, monitor  [wal_fsync_duration_seconds][wal_fsync_duration_seconds] (p99 duration should be less than 10ms) to confirm the disk is reasonably fast. If the disk is too slow, assigning a dedicated disk to etcd or using faster disk will typically solve the problem.
+Usually this issue is caused by a slow disk. Before the leader sends heartbeats attached with metadata, it may need to persist the metadata to disk. The disk could be experiencing contention among etcd and other applications, or the disk is too simply slow (e.g., a shared virtualized disk). To rule out a slow disk from causing this warning, monitor  [wal_fsync_duration_seconds][wal_fsync_duration_seconds] (p99 duration should be less than 10ms) to confirm the disk is reasonably fast. If the disk is too slow, assigning a dedicated disk to etcd or using faster disk will typically solve the problem. To tell whether a disk is fast enough for etcd, a benchmarking tool such as [fio][fio] can be used. Read [here][fio-blog-post] for an example.
 
 The second most common cause is CPU starvation. If monitoring of the machine’s CPU usage shows heavy utilization, there may not be enough compute capacity for etcd. Moving etcd to dedicated machine, increasing process resource isolation  with cgroups, or renicing the etcd server process into a higher priority can usually solve the problem.
 
@@ -147,15 +149,17 @@ etcd sends a snapshot of its complete key-value store to refresh slow followers
 [supported-platform]: ./op-guide/supported-platform.md
 [wal_fsync_duration_seconds]: ./metrics.md#disk
 [tuning]: ./tuning.md
-[new_issue]: https://github.com/coreos/etcd/issues/new
+[new_issue]: https://github.com/etcd-io/etcd/issues/new
 [backend_commit_metrics]: ./metrics.md#disk
 [raft]: https://raft.github.io/raft.pdf
-[backup]: https://github.com/coreos/etcd/blob/master/Documentation/op-guide/recovery.md#snapshotting-the-keyspace
+[backup]: https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/recovery.md#snapshotting-the-keyspace
 [chubby]: http://static.googleusercontent.com/media/research.google.com/en//archive/chubby-osdi06.pdf
-[runtime reconfiguration]: https://github.com/coreos/etcd/blob/master/Documentation/op-guide/runtime-configuration.md
+[runtime reconfiguration]: https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/runtime-configuration.md
 [benchmark]: https://github.com/coreos/etcd/tree/master/tools/benchmark
-[benchmark-result]: https://github.com/coreos/etcd/blob/master/Documentation/op-guide/performance.md
+[benchmark-result]: https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/performance.md
 [api-mvcc]: learning/api.md#revisions
 [maintenance-compact]:  op-guide/maintenance.md#history-compaction
 [maintenance-defragment]: op-guide/maintenance.md#defragmentation
 [maintenance-disarm]: ../etcdctl/README.md#alarm-disarm
+[fio]: https://github.com/axboe/fio
+[fio-blog-post]: https://www.ibm.com/blogs/bluemix/2019/04/using-fio-to-tell-whether-your-storage-is-fast-enough-for-etcd/

Documentation/integrations.md

@@ -1,8 +1,10 @@
-# Libraries and tools
+---
+title: Libraries and tools
+---
 
 **Tools**
 
-- [etcdctl](https://github.com/coreos/etcd/tree/master/etcdctl) - A command line client for etcd
+- [etcdctl](https://github.com/etcd-io/etcd/tree/master/etcdctl) - A command line client for etcd
 - [etcd-backup](https://github.com/fanhattan/etcd-backup) - A powerful command line utility for dumping/restoring etcd - Supports v2
 - [etcd-dump](https://npmjs.org/package/etcd-dump) - Command line utility for dumping/restoring etcd.
 - [etcd-fs](https://github.com/xetorthio/etcd-fs) - FUSE filesystem for etcd
@@ -19,14 +21,14 @@
 
 **Go libraries**
 
-- [etcd/clientv3](https://github.com/coreos/etcd/blob/master/clientv3) - the officially maintained Go client for v3
-- [etcd/client](https://github.com/coreos/etcd/blob/master/client) - the officially maintained Go client for v2
+- [etcd/clientv3](https://github.com/etcd-io/etcd/blob/master/clientv3) - the officially maintained Go client for v3
+- [etcd/client](https://github.com/etcd-io/etcd/blob/master/client) - the officially maintained Go client for v2
 - [go-etcd](https://github.com/coreos/go-etcd) - the deprecated official client. May be useful for older (<2.0.0) versions of etcd.
 - [encWrapper](https://github.com/lumjjb/etcd/tree/enc_wrapper/clientwrap/encwrapper) - encWrapper is an encryption wrapper for the etcd client Keys API/KV.
 
 **Java libraries**
 
-- [coreos/jetcd](https://github.com/coreos/jetcd) - Supports v3
+- [coreos/jetcd](https://github.com/etcd-io/jetcd) - Supports v3
 - [boonproject/etcd](https://github.com/boonproject/boon/blob/master/etcd/README.md) - Supports v2, Async/Sync and waits
 - [justinsb/jetcd](https://github.com/justinsb/jetcd)
 - [diwakergupta/jetcd](https://github.com/diwakergupta/jetcd) - Supports v2
@@ -54,6 +56,7 @@
 - [txaio-etcd](https://github.com/crossbario/txaio-etcd) - Asynchronous etcd v3-only client library for Twisted (today) and asyncio (future)
 - [dims/etcd3-gateway](https://github.com/dims/etcd3-gateway) - etcd v3 API library using the HTTP grpc gateway
 - [aioetcd3](https://github.com/gaopeiliang/aioetcd3) - (Python 3.6+) etcd v3 API for asyncio
+- [Revolution1/etcd3-py](https://github.com/Revolution1/etcd3-py) - (python2.7 and python3.5+) Python client for etcd v3, using gRPC-JSON-Gateway
 
 **Node libraries**
 
@@ -89,7 +92,8 @@
 
 **Erlang libraries**
 
-- [marshall-lee/etcd.erl](https://github.com/marshall-lee/etcd.erl)
+- [marshall-lee/etcd.erl](https://github.com/marshall-lee/etcd.erl) - Supports v2
+- [zhongwencool/eetcd](https://github.com/zhongwencool/eetcd) - Supports v3+ (GRPC only)
 
 **.Net Libraries**
 
@@ -167,4 +171,9 @@
 - [Vitess](http://vitess.io/) - Vitess is a database clustering system for horizontal scaling of MySQL.
 - [lclarkmichalek/etcdhcp](https://github.com/lclarkmichalek/etcdhcp) - DHCP server that uses etcd for persistence and coordination.
 - [openstack/networking-vpp](https://github.com/openstack/networking-vpp) - A networking driver that programs the [FD.io VPP dataplane](https://wiki.fd.io/view/VPP) to provide [OpenStack](https://www.openstack.org/) cloud virtual networking
-- [openstack](https://github.com/openstack/governance/blob/master/reference/base-services.rst) - OpenStack services can rely on etcd as a base service.
+- [OpenStack](https://github.com/openstack/governance/blob/master/reference/base-services.rst) - OpenStack services can rely on etcd as a base service.
+- [CoreDNS](https://github.com/coredns/coredns/tree/master/plugin/etcd) - CoreDNS is a DNS server that chains plugins, part of CNCF and Kubernetes
+- [Uber M3](https://github.com/m3db/m3) - M3: Uber’s Open Source, Large-scale Metrics Platform for Prometheus
+- [Rook](https://github.com/rook/rook) - Storage Orchestration for Kubernetes
+- [Patroni](https://github.com/zalando/patroni) - A template for PostgreSQL High Availability with ZooKeeper, etcd, or Consul
+- [Trillian](https://github.com/google/trillian) - Trillian implements a Merkle tree whose contents are served from a data storage layer, to allow scalability to extremely large trees.

Documentation/learning/api.md

@@ -1,4 +1,6 @@
-# etcd3 API
+---
+title: etcd3 API
+---
 
 This document is meant to give an overview of the etcd3 API's central design. It is by no means all encompassing, but intended to focus on the basic ideas needed to understand etcd without the distraction of less common API calls. All etcd3 API's are defined in [gRPC services][grpc-service], which categorize remote procedure calls (RPCs) understood by the etcd server. A full listing of all etcd RPCs are documented in markdown in the [gRPC API listing][grpc-api].
 
@@ -472,10 +474,10 @@ message LeaseKeepAliveResponse {
 * ID - the lease that was refreshed with a new TTL.
 * TTL - the new time-to-live, in seconds, that the lease has remaining.
 
-[elections]: https://github.com/coreos/etcd/blob/master/clientv3/concurrency/election.go
-[kv-proto]: https://github.com/coreos/etcd/blob/master/mvcc/mvccpb/kv.proto
+[elections]: https://github.com/etcd-io/etcd/blob/master/clientv3/concurrency/election.go
+[kv-proto]: https://github.com/etcd-io/etcd/blob/master/mvcc/mvccpb/kv.proto
 [grpc-api]: ../dev-guide/api_reference_v3.md
-[grpc-service]: https://github.com/coreos/etcd/blob/master/etcdserver/etcdserverpb/rpc.proto
-[locks]: https://github.com/coreos/etcd/blob/master/clientv3/concurrency/mutex.go
+[grpc-service]: https://github.com/etcd-io/etcd/blob/master/etcdserver/etcdserverpb/rpc.proto
+[locks]: https://github.com/etcd-io/etcd/blob/master/clientv3/concurrency/mutex.go
 [mvcc]: https://en.wikipedia.org/wiki/Multiversion_concurrency_control
-[stm]: https://github.com/coreos/etcd/blob/master/clientv3/concurrency/stm.go
+[stm]: https://github.com/etcd-io/etcd/blob/master/clientv3/concurrency/stm.go

Documentation/learning/api_guarantees.md

@@ -1,4 +1,6 @@
-# KV API guarantees
+---
+title: KV API guarantees
+---
 
 etcd is a consistent and durable key value store with [mini-transaction][txn] support. The key value store is exposed through the KV APIs. etcd tries to ensure the strongest consistency and durability guarantees for a distributed system. This specification enumerates the KV API guarantees made by etcd.
 

Documentation/learning/data_model.md

@@ -1,4 +1,6 @@
-# Data model
+---
+title: Data model
+---
 
 etcd is designed to reliably store infrequently updated data and provide reliable watch queries. etcd exposes previous versions of key-value pairs to support inexpensive snapshots and watch history events (“time travel queries”). A persistent, multi-version, concurrency-control data model is a good fit for these use cases.
 

Documentation/learning/design-auth-v3.md

@@ -1,4 +1,6 @@
-# etcd v3 authentication design
+---
+title: etcd v3 authentication design
+---
 
 ## Why not reuse the v2 auth system?
 
@@ -26,7 +28,7 @@ The metadata for auth should also be stored and managed in the storage controlle
 The authentication mechanism in the etcd v2 protocol has a tricky part because the metadata consistency should work as in the above, but does not: each permission check is processed by the etcd member that receives the client request (etcdserver/api/v2http/client.go), including follower members. Therefore, it's possible the check may be based on stale metadata.
 
 
-This staleness means that auth configuration cannot be reflected as soon as operators execute etcdctl. Therefore there is no way to know how long the stale metadata is active. Practically, the configuration change is reflected immediately after the command execution. However, in some cases of heavy load, the inconsistent state can be prolonged and it might result in counter-intuitive situations for users and developers. It requires a workaround like this: https://github.com/coreos/etcd/pull/4317#issuecomment-179037582
+This staleness means that auth configuration cannot be reflected as soon as operators execute etcdctl. Therefore there is no way to know how long the stale metadata is active. Practically, the configuration change is reflected immediately after the command execution. However, in some cases of heavy load, the inconsistent state can be prolonged and it might result in counter-intuitive situations for users and developers. It requires a workaround like this: https://github.com/etcd-io/etcd/pull/4317#issuecomment-179037582
 
 ### Inconsistent permissions are unsafe for linearized requests
 

Documentation/learning/design-client.md

@@ -0,0 +1,138 @@
+---
+title: etcd client design
+---
+
+etcd Client Design
+==================
+
+*Gyuho Lee (github.com/gyuho, Amazon Web Services, Inc.), Joe Betz (github.com/jpbetz, Google Inc.)*
+
+
+Introduction
+============
+
+etcd server has proven its robustness with years of failure injection testing. Most complex application logic is already handled by etcd server and its data stores (e.g. cluster membership is transparent to clients, with Raft-layer forwarding proposals to leader). Although server components are correct, its composition with client requires a different set of intricate protocols to guarantee its correctness and high availability under faulty conditions. Ideally, etcd server provides one logical cluster view of many physical machines, and client implements automatic failover between replicas. This documents client architectural decisions and its implementation details.
+
+
+Glossary
+========
+
+*clientv3*: etcd Official Go client for etcd v3 API.
+
+*clientv3-grpc1.0*: Official client implementation, with [`grpc-go v1.0.x`](https://github.com/grpc/grpc-go/releases/tag/v1.0.0), which is used in latest etcd v3.1.
+
+*clientv3-grpc1.7*: Official client implementation, with [`grpc-go v1.7.x`](https://github.com/grpc/grpc-go/releases/tag/v1.7.0), which is used in latest etcd v3.2 and v3.3.
+
+*clientv3-grpc1.23*: Official client implementation, with [`grpc-go v1.23.x`](https://github.com/grpc/grpc-go/releases/tag/v1.23.0), which is used in latest etcd v3.4.
+
+*Balancer*: etcd client load balancer that implements retry and failover mechanism. etcd client should automatically balance loads between multiple endpoints.
+
+*Endpoints*: A list of etcd server endpoints that clients can connect to. Typically, 3 or 5 client URLs of an etcd cluster.
+
+*Pinned endpoint*: When configured with multiple endpoints, <= v3.3 client balancer chooses only one endpoint to establish a TCP connection, in order to conserve total open connections to etcd cluster. In v3.4, balancer round-robins pinned endpoints for every request, thus distributing loads more evenly.
+
+*Client Connection*: TCP connection that has been established to an etcd server, via gRPC Dial.
+
+*Sub Connection*: gRPC SubConn interface. Each sub-connection contains a list of addresses. Balancer creates a SubConn from a list of resolved addresses. gRPC ClientConn can map to multiple SubConn (e.g. example.com resolves to `10.10.10.1` and `10.10.10.2` of two sub-connections). etcd v3.4 balancer employs internal resolver to establish one sub-connection for each endpoint.
+
+*Transient disconnect*: When gRPC server returns a status error of [`code Unavailable`](https://godoc.org/google.golang.org/grpc/codes#Code).
+
+
+Client Requirements
+===================
+
+*Correctness*. Requests may fail in the presence of server faults. However, it never violates consistency guarantees: global ordering properties, never write corrupted data, at-most once semantics for mutable operations, watch never observes partial events, and so on.
+
+*Liveness*. Servers may fail or disconnect briefly. Clients should make progress in either way. Clients should [never deadlock](https://github.com/etcd-io/etcd/issues/8980) waiting for a server to come back from offline, unless configured to do so. Ideally, clients detect unavailable servers with HTTP/2 ping and failover to other nodes with clear error messages.
+
+*Effectiveness*. Clients should operate effectively with minimum resources: previous TCP connections should be [gracefully closed](https://github.com/etcd-io/etcd/issues/9212) after endpoint switch. Failover mechanism should effectively predict the next replica to connect, without wastefully retrying on failed nodes.
+
+*Portability*. Official client should be clearly documented and its implementation be applicable to other language bindings. Error handling between different language bindings should be consistent. Since etcd is fully committed to gRPC, implementation should be closely aligned with gRPC long-term design goals (e.g. pluggable retry policy should be compatible with [gRPC retry](https://github.com/grpc/proposal/blob/master/A6-client-retries.md)). Upgrades between two client versions should be non-disruptive.
+
+
+Client Overview
+===============
+
+etcd client implements the following components:
+
+* balancer that establishes gRPC connections to an etcd cluster,
+* API client that sends RPCs to an etcd server, and
+* error handler that decides whether to retry a failed request or switch endpoints.
+
+Languages may differ in how to establish an initial connection (e.g. configure TLS), how to encode and send Protocol Buffer messages to server, how to handle stream RPCs, and so on. However, errors returned from etcd server will be the same. So should be error handling and retry policy.
+
+For example, etcd server may return `"rpc error: code = Unavailable desc = etcdserver: request timed out"`, which is transient error that expects retries. Or return `rpc error: code = InvalidArgument desc = etcdserver: key is not provided`, which means request was invalid and should not be retried. Go client can parse errors with `google.golang.org/grpc/status.FromError`, and Java client with `io.grpc.Status.fromThrowable`.
+
+
+clientv3-grpc1.0: Balancer Overview
+-----------------------------------
+
+`clientv3-grpc1.0` maintains multiple TCP connections when configured with multiple etcd endpoints. Then pick one address and use it to send all client requests. The pinned address is maintained until the client object is closed (see *Figure 1*). When the client receives an error, it randomly picks another and retries.
+
+![client-balancer-figure-01.png](img/client-balancer-figure-01.png)
+
+
+clientv3-grpc1.0: Balancer Limitation
+-------------------------------------
+
+`clientv3-grpc1.0` opening multiple TCP connections may provide faster balancer failover but requires more resources. The balancer does not understand node’s health status or cluster membership. So, it is possible that balancer gets stuck with one failed or partitioned node.
+
+
+clientv3-grpc1.7: Balancer Overview
+------------------------------------
+
+`clientv3-grpc1.7` maintains only one TCP connection to a chosen etcd server. When given multiple cluster endpoints, a client first tries to connect to them all. As soon as one connection is up, balancer pins the address, closing others (see *Figure 2*). The pinned address is to be maintained until the client object is closed. An error, from server or client network fault, is sent to client error handler (see *Figure 3*).
+
+![client-balancer-figure-02.png](img/client-balancer-figure-02.png)
+
+![client-balancer-figure-03.png](img/client-balancer-figure-03.png)
+
+The client error handler takes an error from gRPC server, and decides whether to retry on the same endpoint, or to switch to other addresses, based on the error code and message (see *Figure 4* and *Figure 5*).
+
+![client-balancer-figure-04.png](img/client-balancer-figure-04.png)
+
+![client-balancer-figure-05.png](img/client-balancer-figure-05.png)
+
+Stream RPCs, such as Watch and KeepAlive, are often requested with no timeouts. Instead, client can send periodic HTTP/2 pings to check the status of a pinned endpoint; if the server does not respond to the ping, balancer switches to other endpoints (see *Figure 6*).
+
+![client-balancer-figure-06.png](img/client-balancer-figure-06.png)
+
+
+clientv3-grpc1.7: Balancer Limitation
+-------------------------------------
+
+`clientv3-grpc1.7` balancer sends HTTP/2 keepalives to detect disconnects from streaming requests. It is a simple gRPC server ping mechanism and does not reason about cluster membership, thus unable to detect network partitions. Since partitioned gRPC server can still respond to client pings, balancer may get stuck with a partitioned node. Ideally, keepalive ping detects partition and triggers endpoint switch, before request time-out (see [etcd#8673](https://github.com/etcd-io/etcd/issues/8673) and *Figure 7*).
+
+![client-balancer-figure-07.png](img/client-balancer-figure-07.png)
+
+`clientv3-grpc1.7` balancer maintains a list of unhealthy endpoints. Disconnected addresses are added to “unhealthy” list, and considered unavailable until after wait duration, which is hard coded as dial timeout with default value 5-second. Balancer can have false positives on which endpoints are unhealthy. For instance, endpoint A may come back right after being blacklisted, but still unusable for next 5 seconds (see *Figure 8*).
+
+`clientv3-grpc1.0` suffered the same problems above.
+
+![client-balancer-figure-08.png](img/client-balancer-figure-08.png)
+
+Upstream gRPC Go had already migrated to new balancer interface. For example, `clientv3-grpc1.7` underlying balancer implementation uses new gRPC balancer and tries to be consistent with old balancer behaviors. While its compatibility has been maintained reasonably well, etcd client still [suffered from subtle breaking changes](https://github.com/grpc/grpc-go/issues/1649). Furthermore, gRPC maintainer recommends to [not rely on the old balancer interface](https://github.com/grpc/grpc-go/issues/1942#issuecomment-375368665). In general, to get better support from upstream, it is best to be in sync with latest gRPC releases. And new features, such as retry policy, may not be backported to gRPC 1.7 branch. Thus, both etcd server and client must migrate to latest gRPC versions.
+
+
+clientv3-grpc1.23: Balancer Overview
+------------------------------------
+
+`clientv3-grpc1.7` is so tightly coupled with old gRPC interface, that every single gRPC dependency upgrade broke client behavior. Majority of development and debugging efforts were devoted to fixing those client behavior changes. As a result, its implementation has become overly complicated with bad assumptions on server connectivities.
+
+The primary goal of `clientv3-grpc1.23` is to simplify balancer failover logic; rather than maintaining a list of unhealthy endpoints, which may be stale, simply roundrobin to the next endpoint whenever client gets disconnected from the current endpoint. It does not assume endpoint status. Thus, no more complicated status tracking is needed (see *Figure 8* and above). Upgrading to `clientv3-grpc1.23` should be no issue; all changes were internal while keeping all the backward compatibilities.
+
+Internally, when given multiple endpoints, `clientv3-grpc1.23` creates multiple sub-connections (one sub-connection per each endpoint), while `clientv3-grpc1.7` creates only one connection to a pinned endpoint (see *Figure 9*). For instance, in 5-node cluster, `clientv3-grpc1.23` balancer would require 5 TCP connections, while `clientv3-grpc1.7` only requires one. By preserving the pool of TCP connections, `clientv3-grpc1.23` may consume more resources but provide more flexible load balancer with better failover performance. The default balancing policy is round robin but can be easily extended to support other types of balancers (e.g. power of two, pick leader, etc.). `clientv3-grpc1.23` uses gRPC resolver group and implements balancer picker policy, in order to delegate complex balancing work to upstream gRPC. On the other hand, `clientv3-grpc1.7` manually handles each gRPC connection and balancer failover, which complicates the implementation. `clientv3-grpc1.23` implements retry in the gRPC interceptor chain that automatically handles gRPC internal errors and enables more advanced retry policies like backoff, while `clientv3-grpc1.7` manually interprets gRPC errors for retries.
+
+![client-balancer-figure-09.png](img/client-balancer-figure-09.png)
+
+
+clientv3-grpc1.23: Balancer Limitation
+--------------------------------------
+
+Improvements can be made by caching the status of each endpoint. For instance, balancer can ping each server in advance to maintain a list of healthy candidates, and use this information when doing round-robin. Or when disconnected, balancer can prioritize healthy endpoints. This may complicate the balancer implementation, thus can be addressed in later versions.
+
+Client-side keepalive ping still does not reason about network partitions. Streaming request may get stuck with a partitioned node. Advanced health checking service need to be implemented to understand the cluster membership (see [etcd#8673](https://github.com/etcd-io/etcd/issues/8673) for more detail).
+
+![client-balancer-figure-07.png](img/client-balancer-figure-07.png)
+
+Currently, retry logic is handled manually as an interceptor. This may be simplified via [official gRPC retries](https://github.com/grpc/proposal/blob/master/A6-client-retries.md).

Documentation/learning/design-learner.md

@@ -0,0 +1,128 @@
+---
+title: etcd learner design
+---
+
+etcd Learner
+============
+
+*Gyuho Lee (github.com/gyuho, Amazon Web Services, Inc.), Joe Betz (github.com/jpbetz, Google Inc.)*
+
+
+Background
+==========
+
+Membership reconfiguration has been one of the biggest operational challenges. Let’s review common challenges.
+
+### 1. New Cluster member overloads Leader
+A newly joined etcd member starts with no data, thus demanding more updates from leader until it catches up with leader’s logs. Then leader’s network is more likely to be overloaded, blocking or dropping leader heartbeats to followers. In such case, a follower may election-timeout to start a new leader election. That is, a cluster with a new member is more vulnerable to leader election. Both leader election and the subsequent update propagation to the new member are prone to causing periods of cluster unavailability (see *Figure 1*).
+
+![server-learner-figure-01](img/server-learner-figure-01.png)
+
+### 2. Network Partitions scenarios
+What if network partition happens? It depends on leader partition. If the leader still maintains the active quorum, the cluster would continue to operate (see *Figure 2*).
+
+![server-learner-figure-02](img/server-learner-figure-02.png)
+
+#### 2.1 Leader isolation
+What if the leader becomes isolated from the rest of the cluster? Leader monitors progress of each follower. When leader loses connectivity from the quorum, it reverts back to follower which will affect the cluster availability (see *Figure 3*).
+
+![server-learner-figure-03](img/server-learner-figure-03.png)
+
+When a new node is added to 3 node cluster, the cluster size becomes 4 and the quorum size becomes 3. What if a new node had joined the cluster, and then network partition happens? It depends on which partition the new member gets located after partition. 
+
+#### 2.2 Cluster Split 3+1
+If the new node happens to be located in the same partition as leader’s, the leader still maintains the active quorum of 3. No leadership election happens, and no cluster availability gets affected (see *Figure 4*).
+
+![server-learner-figure-04](img/server-learner-figure-04.png)
+
+#### 2.3 Cluster Split 2+2
+If the cluster is 2-and-2 partitioned, then neither of partition maintains the quorum of 3. In this case, leadership election happens (see *Figure 5*).
+
+![server-learner-figure-05](img/server-learner-figure-05.png)
+
+#### 2.4 Quorum Lost
+What if network partition happens first, and then a new member gets added? A partitioned 3-node cluster already has one disconnected follower. When a new member is added, the quorum changes from 2 to 3. Now, this cluster has only 2 active nodes out 4, thus losing quorum and starting a new leadership election (see *Figure 6*).
+
+![server-learner-figure-06](img/server-learner-figure-06.png)
+
+Since member add operation can change the size of quorum, it is always recommended to “member remove” first to replace an unhealthy node.
+
+Adding a new member to a 1-node cluster changes the quorum size to 2, immediately causing a leader election when the previous leader finds out quorum is not active. This is because “member add” operation is a 2-step process where user needs to apply “member add” command first, and then starts the new node process (see *Figure 7*).
+
+![server-learner-figure-07](img/server-learner-figure-07.png)
+
+### 3. Cluster Misconfigurations
+An even worse case is when an added member is misconfigured. Membership reconfiguration is a two-step process: “etcdctl member add” and starting an etcd server process with the given peer URL. That is, “member add” command is applied regardless of URL, even when the URL value is invalid. If the first step is applied with invalid URLs, the second step cannot even start the new etcd. Once the cluster loses quorum, there is no way to revert the membership change (see *Figure 8*).
+
+![server-learner-figure-08](img/server-learner-figure-08.png)
+
+Same applies to a multi-node cluster. For example, the cluster has two members down (one is failed, the other is misconfigured) and two members up, but now it requires at least 3 votes to change the cluster membership (see *Figure 9*).
+
+![server-learner-figure-09](img/server-learner-figure-09.png)
+
+As seen above, a simple misconfiguration can fail the whole cluster into an inoperative state. In such case, an operator need manually recreate the cluster with `etcd --force-new-cluster` flag. As etcd has become a mission-critical service for Kubernetes, even the slightest outage may have significant impact on users. What can we better to make etcd such operations easier? Among other things, leader election is most critical to cluster availability: Can we make membership reconfiguration less disruptive by not changing the size of quorum? Can a new node be idle, only requesting the minimum updates from leader, until it catches up? Can membership misconfiguration be always reversible and handled in a more secure way (wrong member add command run should never fail the cluster)? Should an user worry about network topology when adding a new member? Can member add API work regardless of the location of nodes and ongoing network partitions?
+
+Raft Learner
+============
+
+In order to mitigate such availability gaps in the previous section, [Raft §4.2.1](https://github.com/ongardie/dissertation/blob/master/stanford.pdf) introduces a new node state “Learner”, which joins the cluster as a **non-voting member** until it catches up to leader’s logs.
+
+Features in v3.4
+----------------
+
+An operator should do the minimum amount of work possible to add a new learner node. `member add --learner` command to add a new learner, which joins cluster as a non-voting member but still receives all data from leader (see *Figure 10*).
+
+![server-learner-figure-10](img/server-learner-figure-10.png)
+
+When a learner has caught up with leader’s progress, the learner can be promoted to a voting member using `member promote` API, which then counts towards the quorum (see *Figure 11*).
+
+![server-learner-figure-11](img/server-learner-figure-11.png)
+
+etcd server validates promote request to ensure its operational safety. Only after its log has caught up to leader’s can learner be promoted to a voting member (see *Figure 12*).
+
+![server-learner-figure-12](img/server-learner-figure-12.png)
+
+Learner only serves as a standby node until promoted: Leadership cannot be transferred to learner. Learner rejects client reads and writes (client balancer should not route requests to learner). Which means learner does not need issue Read Index requests to leader. Such limitation simplifies the initial learner implementation in v3.4 release (see *Figure 13*).
+
+![server-learner-figure-13](img/server-learner-figure-13.png)
+
+In addition, etcd limits the total number of learners that a cluster can have, and avoids overloading the leader with log replication. Learner never promotes itself. While etcd provides learner status information and safety checks, cluster operator must make the final decision whether to promote learner or not.
+
+Features in v3.5
+----------------
+
+*Make learner state only and default*: Defaulting a new member state to learner will greatly improve membership reconfiguration safety, because learner does not change the size of quorum. Misconfiguration will always be reversible without losing the quorum.
+
+*Make voting-member promotion fully automatic*: Once a learner catches up to leader’s logs, a cluster can automatically promote the learner. etcd requires certain thresholds to be defined by the user, and once the requirements are satisfied, learner promotes itself to a voting member. From a user’s perspective, “member add” command would work the same way as today but with greater safety provided by learner feature.
+
+*Make learner standby failover node*: A learner joins as a standby node, and gets automatically promoted when the cluster availability is affected.
+
+*Make learner read-only*: A learner can serve as a read-only node that never gets promoted. In a weak consistency mode, learner only receives data from leader and never process writes. Serving reads locally without consensus overhead would greatly decrease the workloads to leader but may serve stale data. In a strong consistency mode, learner requests read index from leader to serve latest data, but still rejects writes.
+
+Learner vs. Mirror Maker
+========================
+
+etcd implements “mirror maker” using watch API to continuously relay key creates and updates to a separate cluster. Mirroring usually has low latency overhead once it completes initial synchronization. Learner and mirroring overlap in that both can be used to replicate existing data for read-only. However, mirroring does not guarantee linearizability. During network disconnects, previous key-values might have been discarded, and clients are expected to verify watch responses for correct ordering. Thus, there is no ordering guarantee in mirror. Use mirror for minimum latency (e.g. cross data center) at the costs of consistency. Use learner to retain all historical data and its ordering.
+
+Appendix: Learner Implementation in v3.4
+========================================
+
+*Expose "Learner" node type to "MemberAdd" API.*
+
+etcd client adds a flag to “MemberAdd” API for learner node. And etcd server handler applies membership change entry with `pb.ConfChangeAddLearnerNode` type. Once the command has been applied, a server joins the cluster with `etcd --initial-cluster-state=existing` flag. This learner node can neither vote nor count as quorum.
+
+etcd server must not transfer leadership to learner, since it may still lag behind and does not count as quorum. etcd server limits the number of learners that cluster can have to one: the more learners we have, the more data the leader has to propagate. Clients may talk to learner node, but learner rejects all requests other than serializable read and member status API. This is for simplicity of initial implementation. In the future, learner can be extended as a read-only server that continuously mirrors cluster data. Client balancer must provide helper function to exclude learner node endpoint. Otherwise, request sent to learner may fail. Client sync member call should factor into learner node type. So should client endpoints update call.
+
+`MemberList` and `MemberStatus` responses should indicate which node is learner.
+
+*Add "MemberPromote" API.*
+
+Internally in Raft, second `MemberAdd` call to learner node promotes it to a voting member. Leader maintains the progress of each follower and learner. If learner has not completed its snapshot message, reject promote request. Only accept promote request if and only if: The learner node is in a healthy state. The learner is in sync with leader or the delta is within the threshold (e.g. the number of entries to replicate to learner is less than 1/10 of snapshot count, which means it is less likely that even after promotion leader would not need send snapshot to the learner). All these logic are hard-coded in `etcdserver` package and not configurable.
+
+Reference
+=========
+
+- Original github issue: [etcd#9161](https://github.com/etcd-io/etcd/issues/9161)
+- Use case: [etcd#3715](https://github.com/etcd-io/etcd/issues/3715)
+- Use case: [etcd#8888](https://github.com/etcd-io/etcd/issues/8888)
+- Use case: [etcd#10114](https://github.com/etcd-io/etcd/issues/10114)

Documentation/learning/glossary.md

@@ -1,4 +1,6 @@
-# Glossary
+---
+title: Glossary
+---
 
 This document defines the various terms used in etcd documentation, command line and source code.
 

Documentation/learning/why.md

@@ -1,4 +1,6 @@
-# etcd versus other key-value stores
+---
+title: etcd versus other key-value stores
+---
 
 The name "etcd" originated from two ideas, the unix "/etc" folder and "d"istributed systems. The "/etc" folder is a place to store configuration data for a single system whereas etcd stores configuration information for large scale distributed systems. Hence, a "d"istributed "/etc" is "etcd".
 
@@ -76,18 +78,18 @@ In theory, it’s possible to build these primitives atop any storage systems pr
 For distributed coordination, choosing etcd can help prevent operational headaches and save engineering effort.
 
 [production-users]: ../production-users.md
-[grpc]: http://www.grpc.io
+[grpc]: https://www.grpc.io
 [consul-bulletproof]: https://www.consul.io/docs/internals/sessions.html
 [curator]: http://curator.apache.org/
 [cockroach]: https://github.com/cockroachdb/cockroach
 [spanner]: https://cloud.google.com/spanner/
 [tidb]: https://github.com/pingcap/tidb
-[etcd-v3lock]: https://godoc.org/github.com/coreos/etcd/etcdserver/api/v3lock/v3lockpb
-[etcd-v3election]: https://godoc.org/github.com/coreos/etcd/etcdserver/api/v3election/v3electionpb
+[etcd-v3lock]: https://godoc.org/github.com/etcd-io/etcd/etcdserver/api/v3lock/v3lockpb
+[etcd-v3election]: https://godoc.org/github.com/coreos/etcd-io/etcdserver/api/v3election/v3electionpb
 [etcd-etcdctl-lock]: ../../etcdctl/README.md#lock-lockname-command-arg1-arg2-
 [etcd-etcdctl-elect]: ../../etcdctl/README.md#elect-options-election-name-proposal
 [etcd-mvcc]: data_model.md
-[etcd-recipe]: https://godoc.org/github.com/coreos/etcd/contrib/recipes
+[etcd-recipe]: https://godoc.org/github.com/etcd-io/etcd/contrib/recipes
 [consul-lock]: https://www.consul.io/docs/commands/lock.html
 [newsql-leader]: http://dl.acm.org/citation.cfm?id=2960999
 [etcd-reconfig]: ../op-guide/runtime-configuration.md
@@ -112,5 +114,5 @@ For distributed coordination, choosing etcd can help prevent operational headach
 [zk-bindings]: https://zookeeper.apache.org/doc/r3.1.2/zookeeperProgrammers.html#ch_bindings
 [container-linux]: https://coreos.com/why
 [locksmith]: https://github.com/coreos/locksmith
-[kubernetes]: http://kubernetes.io/docs/whatisk8s
+[kubernetes]: https://kubernetes.io/docs/concepts/overview/what-is-kubernetes/
 [dbtester-comparison-results]: https://github.com/coreos/dbtester/tree/master/test-results/2018Q1-02-etcd-zookeeper-consul

Documentation/metrics.md

@@ -1,4 +1,6 @@
-# Metrics
+---
+title: Metrics
+---
 
 etcd uses [Prometheus][prometheus] for metrics reporting. The metrics can be used for real-time monitoring and debugging. etcd does not persist its metrics; if a member restarts, the metrics will be reset.
 
@@ -99,7 +101,7 @@ Abnormally high snapshot duration (`snapshot_save_total_duration_seconds`) indic
 
 ## Prometheus supplied metrics
 
-The Prometheus client library provides a number of metrics under the `go` and `process` namespaces. There are a few that are particlarly interesting.
+The Prometheus client library provides a number of metrics under the `go` and `process` namespaces. There are a few that are particularly interesting.
 
 | Name                              | Description                                | Type         |
 |-----------------------------------|--------------------------------------------|--------------|

Documentation/metrics/latest

@@ -465,7 +465,7 @@ etcd_network_client_grpc_sent_bytes_total
 etcd_network_peer_received_bytes_total{From="REMOTE_PEER_NODE_ID"}
 
 # name: "etcd_network_peer_round_trip_time_seconds"
-# description: "Round-Trip-Time histogram between peers."
+# description: "Round-Trip-Time histogram between peers"
 # type: "histogram"
 etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="+Inf"}
 etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.0001"}
@@ -492,16 +492,37 @@ etcd_network_peer_round_trip_time_seconds_sum{To="REMOTE_PEER_NODE_ID"}
 # type: "counter"
 etcd_network_peer_sent_bytes_total{To="REMOTE_PEER_NODE_ID"}
 
+# name: "etcd_server_go_version"
+# description: "Which Go version server is running with. 1 for 'server_go_version' label with current version."
+# type: "gauge"
+etcd_server_go_version{server_go_version="go1.11.1"}
+
 # name: "etcd_server_has_leader"
 # description: "Whether or not a leader exists. 1 is existence, 0 is not."
 # type: "gauge"
 etcd_server_has_leader
 
+# name: "etcd_server_health_failures"
+# description: "The total number of failed health checks"
+# type: "counter"
+etcd_server_health_failures
+
+# name: "etcd_server_health_success"
+# description: "The total number of successful health checks"
+# type: "counter"
+etcd_server_health_success
+
 # name: "etcd_server_heartbeat_send_failures_total"
 # description: "The total number of leader heartbeat send failures (likely overloaded from slow disk)."
 # type: "counter"
 etcd_server_heartbeat_send_failures_total
 
+# name: "etcd_server_id"
+# description: "Server or member ID in hexadecimal format. 1 for 'server_id' label with current ID."
+# type: "gauge"
+etcd_server_id{server_id="221ed218fa16d1fe"}
+etcd_server_id{server_id="3f1ca865609d428d"}
+
 # name: "etcd_server_is_leader"
 # description: "Whether or not this member is a leader. 1 if is, 0 otherwise."
 # type: "gauge"
@@ -512,6 +533,21 @@ etcd_server_is_leader
 # type: "counter"
 etcd_server_leader_changes_seen_total
 
+# name: "etcd_server_is_learner"
+# description: "Whether or not this member is a learner. 1 if is, 0 otherwise."
+# type: "gauge"
+etcd_server_is_learner
+
+# name: "etcd_server_learner_promote_failures"
+# description: "The total number of failed learner promotions (likely learner not ready) while this member is leader."
+# type: "counter"
+etcd_server_learner_promote_failures
+
+# name: "etcd_server_learner_promote_successes"
+# description: "The total number of successful learner promotions while this member is leader."
+# type: "counter"
+etcd_server_learner_promote_successes
+
 # name: "etcd_server_proposals_applied_total"
 # description: "The total number of consensus proposals applied."
 # type: "gauge"
@@ -537,6 +573,11 @@ etcd_server_proposals_pending
 # type: "gauge"
 etcd_server_quota_backend_bytes
 
+# name: "etcd_server_read_indexes_failed_total"
+# description: "The total number of failed read indexes seen."
+# type: "counter"
+etcd_server_read_indexes_failed_total
+
 # name: "etcd_server_slow_apply_total"
 # description: "The total number of slow apply requests (likely overloaded from slow disk)."
 # type: "counter"
@@ -552,6 +593,44 @@ etcd_server_slow_read_indexes_total
 # type: "gauge"
 etcd_server_version{server_version="3.3.0+git"}
 
+# name: "etcd_snap_db_fsync_duration_seconds"
+# description: "The latency distributions of fsyncing .snap.db file"
+# type: "histogram"
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.001"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.002"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.004"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.008"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.016"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.032"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.064"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.128"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.256"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.512"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="1.024"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="2.048"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="4.096"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="8.192"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="+Inf"}
+etcd_snap_db_fsync_duration_seconds_sum
+etcd_snap_db_fsync_duration_seconds_count
+
+# name: "etcd_snap_db_save_total_duration_seconds"
+# description: "The total latency distributions of v3 snapshot save"
+# type: "histogram"
+etcd_snap_db_save_total_duration_seconds_bucket{le="0.1"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="0.2"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="0.4"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="0.8"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="1.6"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="3.2"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="6.4"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="12.8"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="25.6"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="51.2"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="+Inf"}
+etcd_snap_db_save_total_duration_seconds_sum
+etcd_snap_db_save_total_duration_seconds_count
+
 # name: "etcd_snap_fsync_duration_seconds"
 # description: "The latency distributions of fsync called by snap."
 # type: "histogram"

Documentation/metrics/v3.1.20

@@ -0,0 +1,795 @@
+# server version: etcd_server_version{server_version="3.1.20"}
+
+# name: "etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds"
+# description: "Bucketed histogram of db compaction pause duration."
+# type: "histogram"
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="1"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="2"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="4"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="8"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="16"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="32"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="64"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="128"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="256"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="512"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="1024"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="2048"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="4096"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_bucket{le="+Inf"}
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_sum
+etcd_debugging_mvcc_db_compaction_pause_duration_milliseconds_count
+
+# name: "etcd_debugging_mvcc_db_compaction_total_duration_milliseconds"
+# description: "Bucketed histogram of db compaction total duration."
+# type: "histogram"
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="100"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="200"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="400"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="800"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="1600"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="3200"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="6400"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="12800"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="25600"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="51200"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="102400"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="204800"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="409600"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="819200"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_bucket{le="+Inf"}
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_sum
+etcd_debugging_mvcc_db_compaction_total_duration_milliseconds_count
+
+# name: "etcd_debugging_mvcc_db_total_size_in_bytes"
+# description: "Total size of the underlying database physically allocated in bytes. Use etcd_mvcc_db_total_size_in_bytes"
+# type: "gauge"
+etcd_debugging_mvcc_db_total_size_in_bytes
+
+# name: "etcd_debugging_mvcc_delete_total"
+# description: "Total number of deletes seen by this member."
+# type: "counter"
+etcd_debugging_mvcc_delete_total
+
+# name: "etcd_debugging_mvcc_events_total"
+# description: "Total number of events sent by this member."
+# type: "counter"
+etcd_debugging_mvcc_events_total
+
+# name: "etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds"
+# description: "Bucketed histogram of index compaction pause duration."
+# type: "histogram"
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="0.5"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="1"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="2"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="4"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="8"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="16"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="32"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="64"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="128"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="256"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="512"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="1024"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_bucket{le="+Inf"}
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_sum
+etcd_debugging_mvcc_index_compaction_pause_duration_milliseconds_count
+
+# name: "etcd_debugging_mvcc_keys_total"
+# description: "Total number of keys."
+# type: "gauge"
+etcd_debugging_mvcc_keys_total
+
+# name: "etcd_debugging_mvcc_pending_events_total"
+# description: "Total number of pending events to be sent."
+# type: "gauge"
+etcd_debugging_mvcc_pending_events_total
+
+# name: "etcd_debugging_mvcc_put_total"
+# description: "Total number of puts seen by this member."
+# type: "counter"
+etcd_debugging_mvcc_put_total
+
+# name: "etcd_debugging_mvcc_range_total"
+# description: "Total number of ranges seen by this member."
+# type: "counter"
+etcd_debugging_mvcc_range_total
+
+# name: "etcd_debugging_mvcc_slow_watcher_total"
+# description: "Total number of unsynced slow watchers."
+# type: "gauge"
+etcd_debugging_mvcc_slow_watcher_total
+
+# name: "etcd_debugging_mvcc_txn_total"
+# description: "Total number of txns seen by this member."
+# type: "counter"
+etcd_debugging_mvcc_txn_total
+
+# name: "etcd_debugging_mvcc_watch_stream_total"
+# description: "Total number of watch streams."
+# type: "gauge"
+etcd_debugging_mvcc_watch_stream_total
+
+# name: "etcd_debugging_mvcc_watcher_total"
+# description: "Total number of watchers."
+# type: "gauge"
+etcd_debugging_mvcc_watcher_total
+
+# name: "etcd_debugging_snap_save_marshalling_duration_seconds"
+# description: "The marshalling cost distributions of save called by snapshot."
+# type: "histogram"
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="0.001"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="0.002"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="0.004"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="0.008"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="0.016"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="0.032"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="0.064"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="0.128"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="0.256"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="0.512"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="1.024"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="2.048"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="4.096"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="8.192"}
+etcd_debugging_snap_save_marshalling_duration_seconds_bucket{le="+Inf"}
+etcd_debugging_snap_save_marshalling_duration_seconds_sum
+etcd_debugging_snap_save_marshalling_duration_seconds_count
+
+# name: "etcd_debugging_snap_save_total_duration_seconds"
+# description: "The total latency distributions of save called by snapshot."
+# type: "histogram"
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="0.001"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="0.002"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="0.004"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="0.008"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="0.016"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="0.032"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="0.064"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="0.128"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="0.256"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="0.512"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="1.024"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="2.048"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="4.096"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="8.192"}
+etcd_debugging_snap_save_total_duration_seconds_bucket{le="+Inf"}
+etcd_debugging_snap_save_total_duration_seconds_sum
+etcd_debugging_snap_save_total_duration_seconds_count
+
+# name: "etcd_debugging_store_expires_total"
+# description: "Total number of expired keys."
+# type: "counter"
+etcd_debugging_store_expires_total
+
+# name: "etcd_debugging_store_reads_total"
+# description: "Total number of reads action by (get/getRecursive), local to this member."
+# type: "counter"
+etcd_debugging_store_reads_total{action="getRecursive"}
+
+# name: "etcd_debugging_store_watch_requests_total"
+# description: "Total number of incoming watch requests (new or reestablished)."
+# type: "counter"
+etcd_debugging_store_watch_requests_total
+
+# name: "etcd_debugging_store_watchers"
+# description: "Count of currently active watchers."
+# type: "gauge"
+etcd_debugging_store_watchers
+
+# name: "etcd_debugging_store_writes_total"
+# description: "Total number of writes (e.g. set/compareAndDelete) seen by this member."
+# type: "counter"
+etcd_debugging_store_writes_total{action="create"}
+etcd_debugging_store_writes_total{action="set"}
+
+# name: "etcd_disk_backend_commit_duration_seconds"
+# description: "The latency distributions of commit called by backend."
+# type: "histogram"
+etcd_disk_backend_commit_duration_seconds_bucket{le="0.001"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="0.002"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="0.004"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="0.008"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="0.016"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="0.032"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="0.064"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="0.128"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="0.256"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="0.512"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="1.024"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="2.048"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="4.096"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="8.192"}
+etcd_disk_backend_commit_duration_seconds_bucket{le="+Inf"}
+etcd_disk_backend_commit_duration_seconds_sum
+etcd_disk_backend_commit_duration_seconds_count
+
+# name: "etcd_disk_backend_defrag_duration_seconds"
+# description: "The latency distribution of backend defragmentation."
+# type: "histogram"
+etcd_disk_backend_defrag_duration_seconds_bucket{le="0.1"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="0.2"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="0.4"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="0.8"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="1.6"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="3.2"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="6.4"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="12.8"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="25.6"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="51.2"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="102.4"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="204.8"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="409.6"}
+etcd_disk_backend_defrag_duration_seconds_bucket{le="+Inf"}
+etcd_disk_backend_defrag_duration_seconds_sum
+etcd_disk_backend_defrag_duration_seconds_count
+
+# name: "etcd_disk_wal_fsync_duration_seconds"
+# description: "The latency distributions of fsync called by wal."
+# type: "histogram"
+etcd_disk_wal_fsync_duration_seconds_bucket{le="0.001"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="0.002"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="0.004"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="0.008"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="0.016"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="0.032"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="0.064"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="0.128"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="0.256"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="0.512"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="1.024"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="2.048"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="4.096"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="8.192"}
+etcd_disk_wal_fsync_duration_seconds_bucket{le="+Inf"}
+etcd_disk_wal_fsync_duration_seconds_sum
+etcd_disk_wal_fsync_duration_seconds_count
+
+# name: "etcd_grpc_proxy_cache_hits_total"
+# description: "Total number of cache hits"
+# type: "gauge"
+etcd_grpc_proxy_cache_hits_total
+
+# name: "etcd_grpc_proxy_cache_misses_total"
+# description: "Total number of cache misses"
+# type: "gauge"
+etcd_grpc_proxy_cache_misses_total
+
+# name: "etcd_grpc_proxy_events_coalescing_total"
+# description: "Total number of events coalescing"
+# type: "counter"
+etcd_grpc_proxy_events_coalescing_total
+
+# name: "etcd_grpc_proxy_watchers_coalescing_total"
+# description: "Total number of current watchers coalescing"
+# type: "gauge"
+etcd_grpc_proxy_watchers_coalescing_total
+
+# name: "etcd_mvcc_db_total_size_in_bytes"
+# description: "Total size of the underlying database physically allocated in bytes."
+# type: "gauge"
+etcd_mvcc_db_total_size_in_bytes
+
+# name: "etcd_mvcc_db_total_size_in_use_in_bytes"
+# description: "Total size of the underlying database logically in use in bytes."
+# type: "gauge"
+etcd_mvcc_db_total_size_in_use_in_bytes
+
+# name: "etcd_mvcc_hash_duration_seconds"
+# description: "The latency distribution of storage hash operation."
+# type: "histogram"
+etcd_mvcc_hash_duration_seconds_bucket{le="0.01"}
+etcd_mvcc_hash_duration_seconds_bucket{le="0.02"}
+etcd_mvcc_hash_duration_seconds_bucket{le="0.04"}
+etcd_mvcc_hash_duration_seconds_bucket{le="0.08"}
+etcd_mvcc_hash_duration_seconds_bucket{le="0.16"}
+etcd_mvcc_hash_duration_seconds_bucket{le="0.32"}
+etcd_mvcc_hash_duration_seconds_bucket{le="0.64"}
+etcd_mvcc_hash_duration_seconds_bucket{le="1.28"}
+etcd_mvcc_hash_duration_seconds_bucket{le="2.56"}
+etcd_mvcc_hash_duration_seconds_bucket{le="5.12"}
+etcd_mvcc_hash_duration_seconds_bucket{le="10.24"}
+etcd_mvcc_hash_duration_seconds_bucket{le="20.48"}
+etcd_mvcc_hash_duration_seconds_bucket{le="40.96"}
+etcd_mvcc_hash_duration_seconds_bucket{le="81.92"}
+etcd_mvcc_hash_duration_seconds_bucket{le="163.84"}
+etcd_mvcc_hash_duration_seconds_bucket{le="+Inf"}
+etcd_mvcc_hash_duration_seconds_sum
+etcd_mvcc_hash_duration_seconds_count
+
+# name: "etcd_network_client_grpc_received_bytes_total"
+# description: "The total number of bytes received from grpc clients."
+# type: "counter"
+etcd_network_client_grpc_received_bytes_total
+
+# name: "etcd_network_client_grpc_sent_bytes_total"
+# description: "The total number of bytes sent to grpc clients."
+# type: "counter"
+etcd_network_client_grpc_sent_bytes_total
+
+# name: "etcd_network_peer_received_bytes_total"
+# description: "The total number of bytes received from peers."
+# type: "counter"
+etcd_network_peer_received_bytes_total{From="REMOTE_PEER_NODE_ID"}
+
+# name: "etcd_network_peer_round_trip_time_seconds"
+# description: "Round-Trip-Time histogram between peers."
+# type: "histogram"
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="+Inf"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.0001"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.0002"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.0004"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.0008"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.0016"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.0032"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.0064"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.0128"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.0256"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.0512"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.1024"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.2048"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.4096"}
+etcd_network_peer_round_trip_time_seconds_bucket{To="REMOTE_PEER_NODE_ID",le="0.8192"}
+etcd_network_peer_round_trip_time_seconds_count{To="REMOTE_PEER_NODE_ID"}
+etcd_network_peer_round_trip_time_seconds_sum{To="REMOTE_PEER_NODE_ID"}
+
+# name: "etcd_network_peer_sent_bytes_total"
+# description: "The total number of bytes sent to peers."
+# type: "counter"
+etcd_network_peer_sent_bytes_total{To="REMOTE_PEER_NODE_ID"}
+
+# name: "etcd_server_go_version"
+# description: "Which Go version server is running with. 1 for 'server_go_version' label with current version."
+# type: "gauge"
+etcd_server_go_version{server_go_version="go1.8.7"}
+
+# name: "etcd_server_has_leader"
+# description: "Whether or not a leader exists. 1 is existence, 0 is not."
+# type: "gauge"
+etcd_server_has_leader
+
+# name: "etcd_server_health_failures"
+# description: "The total number of failed health checks"
+# type: "counter"
+etcd_server_health_failures
+
+# name: "etcd_server_health_success"
+# description: "The total number of successful health checks"
+# type: "counter"
+etcd_server_health_success
+
+# name: "etcd_server_heartbeat_send_failures_total"
+# description: "The total number of leader heartbeat send failures (likely overloaded from slow disk)."
+# type: "counter"
+etcd_server_heartbeat_send_failures_total
+
+# name: "etcd_server_id"
+# description: "Server or member ID in hexadecimal format. 1 for 'server_id' label with current ID."
+# type: "gauge"
+etcd_server_id{server_id="7339c4e5e833c029"}
+
+# name: "etcd_server_is_leader"
+# description: "Whether or not this member is a leader. 1 if is, 0 otherwise."
+# type: "gauge"
+etcd_server_is_leader
+
+# name: "etcd_server_leader_changes_seen_total"
+# description: "The number of leader changes seen."
+# type: "counter"
+etcd_server_leader_changes_seen_total
+
+# name: "etcd_server_proposals_applied_total"
+# description: "The total number of consensus proposals applied."
+# type: "gauge"
+etcd_server_proposals_applied_total
+
+# name: "etcd_server_proposals_committed_total"
+# description: "The total number of consensus proposals committed."
+# type: "gauge"
+etcd_server_proposals_committed_total
+
+# name: "etcd_server_proposals_failed_total"
+# description: "The total number of failed proposals seen."
+# type: "counter"
+etcd_server_proposals_failed_total
+
+# name: "etcd_server_proposals_pending"
+# description: "The current number of pending proposals to commit."
+# type: "gauge"
+etcd_server_proposals_pending
+
+# name: "etcd_server_quota_backend_bytes"
+# description: "Current backend storage quota size in bytes."
+# type: "gauge"
+etcd_server_quota_backend_bytes
+
+# name: "etcd_server_read_indexes_failed_total"
+# description: "The total number of failed read indexes seen."
+# type: "counter"
+etcd_server_read_indexes_failed_total
+
+# name: "etcd_server_slow_apply_total"
+# description: "The total number of slow apply requests (likely overloaded from slow disk)."
+# type: "counter"
+etcd_server_slow_apply_total
+
+# name: "etcd_server_slow_read_indexes_total"
+# description: "The total number of pending read indexes not in sync with leader's or timed out read index requests."
+# type: "counter"
+etcd_server_slow_read_indexes_total
+
+# name: "etcd_server_version"
+# description: "Which version is running. 1 for 'server_version' label with current version."
+# type: "gauge"
+etcd_server_version{server_version="3.1.20"}
+
+# name: "etcd_snap_db_fsync_duration_seconds"
+# description: "The latency distributions of fsyncing .snap.db file"
+# type: "histogram"
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.001"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.002"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.004"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.008"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.016"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.032"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.064"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.128"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.256"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="0.512"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="1.024"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="2.048"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="4.096"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="8.192"}
+etcd_snap_db_fsync_duration_seconds_bucket{le="+Inf"}
+etcd_snap_db_fsync_duration_seconds_sum
+etcd_snap_db_fsync_duration_seconds_count
+
+# name: "etcd_snap_db_save_total_duration_seconds"
+# description: "The total latency distributions of v3 snapshot save"
+# type: "histogram"
+etcd_snap_db_save_total_duration_seconds_bucket{le="0.1"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="0.2"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="0.4"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="0.8"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="1.6"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="3.2"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="6.4"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="12.8"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="25.6"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="51.2"}
+etcd_snap_db_save_total_duration_seconds_bucket{le="+Inf"}
+etcd_snap_db_save_total_duration_seconds_sum
+etcd_snap_db_save_total_duration_seconds_count
+
+# name: "go_gc_duration_seconds"
+# description: "A summary of the GC invocation durations."
+# type: "summary"
+go_gc_duration_seconds{quantile="0"}
+go_gc_duration_seconds{quantile="0.25"}
+go_gc_duration_seconds{quantile="0.5"}
+go_gc_duration_seconds{quantile="0.75"}
+go_gc_duration_seconds{quantile="1"}
+go_gc_duration_seconds_sum
+go_gc_duration_seconds_count
+
+# name: "go_goroutines"
+# description: "Number of goroutines that currently exist."
+# type: "gauge"
+go_goroutines
+
+# name: "go_memstats_alloc_bytes"
+# description: "Number of bytes allocated and still in use."
+# type: "gauge"
+go_memstats_alloc_bytes
+
+# name: "go_memstats_alloc_bytes_total"
+# description: "Total number of bytes allocated, even if freed."
+# type: "counter"
+go_memstats_alloc_bytes_total
+
+# name: "go_memstats_buck_hash_sys_bytes"
+# description: "Number of bytes used by the profiling bucket hash table."
+# type: "gauge"
+go_memstats_buck_hash_sys_bytes
+
+# name: "go_memstats_frees_total"
+# description: "Total number of frees."
+# type: "counter"
+go_memstats_frees_total
+
+# name: "go_memstats_gc_sys_bytes"
+# description: "Number of bytes used for garbage collection system metadata."
+# type: "gauge"
+go_memstats_gc_sys_bytes
+
+# name: "go_memstats_heap_alloc_bytes"
+# description: "Number of heap bytes allocated and still in use."
+# type: "gauge"
+go_memstats_heap_alloc_bytes
+
+# name: "go_memstats_heap_idle_bytes"
+# description: "Number of heap bytes waiting to be used."
+# type: "gauge"
+go_memstats_heap_idle_bytes
+
+# name: "go_memstats_heap_inuse_bytes"
+# description: "Number of heap bytes that are in use."
+# type: "gauge"
+go_memstats_heap_inuse_bytes
+
+# name: "go_memstats_heap_objects"
+# description: "Number of allocated objects."
+# type: "gauge"
+go_memstats_heap_objects
+
+# name: "go_memstats_heap_released_bytes_total"
+# description: "Total number of heap bytes released to OS."
+# type: "counter"
+go_memstats_heap_released_bytes_total
+
+# name: "go_memstats_heap_sys_bytes"
+# description: "Number of heap bytes obtained from system."
+# type: "gauge"
+go_memstats_heap_sys_bytes
+
+# name: "go_memstats_last_gc_time_seconds"
+# description: "Number of seconds since 1970 of last garbage collection."
+# type: "gauge"
+go_memstats_last_gc_time_seconds
+
+# name: "go_memstats_lookups_total"
+# description: "Total number of pointer lookups."
+# type: "counter"
+go_memstats_lookups_total
+
+# name: "go_memstats_mallocs_total"
+# description: "Total number of mallocs."
+# type: "counter"
+go_memstats_mallocs_total
+
+# name: "go_memstats_mcache_inuse_bytes"
+# description: "Number of bytes in use by mcache structures."
+# type: "gauge"
+go_memstats_mcache_inuse_bytes
+
+# name: "go_memstats_mcache_sys_bytes"
+# description: "Number of bytes used for mcache structures obtained from system."
+# type: "gauge"
+go_memstats_mcache_sys_bytes
+
+# name: "go_memstats_mspan_inuse_bytes"
+# description: "Number of bytes in use by mspan structures."
+# type: "gauge"
+go_memstats_mspan_inuse_bytes
+
+# name: "go_memstats_mspan_sys_bytes"
+# description: "Number of bytes used for mspan structures obtained from system."
+# type: "gauge"
+go_memstats_mspan_sys_bytes
+
+# name: "go_memstats_next_gc_bytes"
+# description: "Number of heap bytes when next garbage collection will take place."
+# type: "gauge"
+go_memstats_next_gc_bytes
+
+# name: "go_memstats_other_sys_bytes"
+# description: "Number of bytes used for other system allocations."
+# type: "gauge"
+go_memstats_other_sys_bytes
+
+# name: "go_memstats_stack_inuse_bytes"
+# description: "Number of bytes in use by the stack allocator."
+# type: "gauge"
+go_memstats_stack_inuse_bytes
+
+# name: "go_memstats_stack_sys_bytes"
+# description: "Number of bytes obtained from system for stack allocator."
+# type: "gauge"
+go_memstats_stack_sys_bytes
+
+# name: "go_memstats_sys_bytes"
+# description: "Number of bytes obtained by system. Sum of all system allocations."
+# type: "gauge"
+go_memstats_sys_bytes
+
+# name: "grpc_server_handled_total"
+# description: "Total number of RPCs completed on the server, regardless of success or failure."
+# type: "counter"
+# gRPC codes: 
+#  - "Aborted"
+#  - "AlreadyExists"
+#  - "Canceled"
+#  - "DataLoss"
+#  - "DeadlineExceeded"
+#  - "FailedPrecondition"
+#  - "Internal"
+#  - "InvalidArgument"
+#  - "NotFound"
+#  - "OK"
+#  - "OutOfRange"
+#  - "PermissionDenied"
+#  - "ResourceExhausted"
+#  - "Unauthenticated"
+#  - "Unavailable"
+#  - "Unimplemented"
+#  - "Unknown"
+grpc_server_handled_total{grpc_code="CODE",grpc_method="Alarm",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="AuthDisable",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="AuthEnable",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="Authenticate",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="Compact",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="Defragment",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="DeleteRange",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="Hash",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="LeaseGrant",grpc_service="etcdserverpb.Lease",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="LeaseKeepAlive",grpc_service="etcdserverpb.Lease",grpc_type="bidi_stream"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="LeaseRevoke",grpc_service="etcdserverpb.Lease",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="LeaseTimeToLive",grpc_service="etcdserverpb.Lease",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="MemberAdd",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="MemberList",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="MemberRemove",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="MemberUpdate",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="Put",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="Range",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="RoleAdd",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="RoleDelete",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="RoleGet",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="RoleGrantPermission",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="RoleList",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="RoleRevokePermission",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="Snapshot",grpc_service="etcdserverpb.Maintenance",grpc_type="server_stream"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="Status",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="Txn",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="UserAdd",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="UserChangePassword",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="UserDelete",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="UserGet",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="UserGrantRole",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="UserList",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="UserRevokeRole",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_handled_total{grpc_code="CODE",grpc_method="Watch",grpc_service="etcdserverpb.Watch",grpc_type="bidi_stream"}
+
+# name: "grpc_server_msg_received_total"
+# description: "Total number of RPC stream messages received on the server."
+# type: "counter"
+grpc_server_msg_received_total{grpc_method="Alarm",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="AuthDisable",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="AuthEnable",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="Authenticate",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="Compact",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="Defragment",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="DeleteRange",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="Hash",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="LeaseGrant",grpc_service="etcdserverpb.Lease",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="LeaseKeepAlive",grpc_service="etcdserverpb.Lease",grpc_type="bidi_stream"}
+grpc_server_msg_received_total{grpc_method="LeaseRevoke",grpc_service="etcdserverpb.Lease",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="LeaseTimeToLive",grpc_service="etcdserverpb.Lease",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="MemberAdd",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="MemberList",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="MemberRemove",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="MemberUpdate",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="Put",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="Range",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="RoleAdd",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="RoleDelete",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="RoleGet",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="RoleGrantPermission",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="RoleList",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="RoleRevokePermission",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="Snapshot",grpc_service="etcdserverpb.Maintenance",grpc_type="server_stream"}
+grpc_server_msg_received_total{grpc_method="Status",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="Txn",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="UserAdd",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="UserChangePassword",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="UserDelete",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="UserGet",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="UserGrantRole",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="UserList",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="UserRevokeRole",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_received_total{grpc_method="Watch",grpc_service="etcdserverpb.Watch",grpc_type="bidi_stream"}
+
+# name: "grpc_server_msg_sent_total"
+# description: "Total number of gRPC stream messages sent by the server."
+# type: "counter"
+grpc_server_msg_sent_total{grpc_method="Alarm",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="AuthDisable",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="AuthEnable",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="Authenticate",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="Compact",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="Defragment",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="DeleteRange",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="Hash",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="LeaseGrant",grpc_service="etcdserverpb.Lease",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="LeaseKeepAlive",grpc_service="etcdserverpb.Lease",grpc_type="bidi_stream"}
+grpc_server_msg_sent_total{grpc_method="LeaseRevoke",grpc_service="etcdserverpb.Lease",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="LeaseTimeToLive",grpc_service="etcdserverpb.Lease",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="MemberAdd",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="MemberList",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="MemberRemove",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="MemberUpdate",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="Put",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="Range",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="RoleAdd",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="RoleDelete",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="RoleGet",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="RoleGrantPermission",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="RoleList",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="RoleRevokePermission",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="Snapshot",grpc_service="etcdserverpb.Maintenance",grpc_type="server_stream"}
+grpc_server_msg_sent_total{grpc_method="Status",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="Txn",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="UserAdd",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="UserChangePassword",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="UserDelete",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="UserGet",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="UserGrantRole",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="UserList",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="UserRevokeRole",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_msg_sent_total{grpc_method="Watch",grpc_service="etcdserverpb.Watch",grpc_type="bidi_stream"}
+
+# name: "grpc_server_started_total"
+# description: "Total number of RPCs started on the server."
+# type: "counter"
+grpc_server_started_total{grpc_method="Alarm",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_started_total{grpc_method="AuthDisable",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="AuthEnable",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="Authenticate",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="Compact",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_started_total{grpc_method="Defragment",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_started_total{grpc_method="DeleteRange",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_started_total{grpc_method="Hash",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_started_total{grpc_method="LeaseGrant",grpc_service="etcdserverpb.Lease",grpc_type="unary"}
+grpc_server_started_total{grpc_method="LeaseKeepAlive",grpc_service="etcdserverpb.Lease",grpc_type="bidi_stream"}
+grpc_server_started_total{grpc_method="LeaseRevoke",grpc_service="etcdserverpb.Lease",grpc_type="unary"}
+grpc_server_started_total{grpc_method="LeaseTimeToLive",grpc_service="etcdserverpb.Lease",grpc_type="unary"}
+grpc_server_started_total{grpc_method="MemberAdd",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_started_total{grpc_method="MemberList",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_started_total{grpc_method="MemberRemove",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_started_total{grpc_method="MemberUpdate",grpc_service="etcdserverpb.Cluster",grpc_type="unary"}
+grpc_server_started_total{grpc_method="Put",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_started_total{grpc_method="Range",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_started_total{grpc_method="RoleAdd",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="RoleDelete",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="RoleGet",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="RoleGrantPermission",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="RoleList",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="RoleRevokePermission",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="Snapshot",grpc_service="etcdserverpb.Maintenance",grpc_type="server_stream"}
+grpc_server_started_total{grpc_method="Status",grpc_service="etcdserverpb.Maintenance",grpc_type="unary"}
+grpc_server_started_total{grpc_method="Txn",grpc_service="etcdserverpb.KV",grpc_type="unary"}
+grpc_server_started_total{grpc_method="UserAdd",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="UserChangePassword",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="UserDelete",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="UserGet",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="UserGrantRole",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="UserList",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="UserRevokeRole",grpc_service="etcdserverpb.Auth",grpc_type="unary"}
+grpc_server_started_total{grpc_method="Watch",grpc_service="etcdserverpb.Watch",grpc_type="bidi_stream"}
+
+# name: "http_request_duration_microseconds"
+# description: "The HTTP request latencies in microseconds."
+# type: "summary"
+http_request_duration_microseconds{handler="prometheus",quantile="0.5"}
+http_request_duration_microseconds{handler="prometheus",quantile="0.9"}
+http_request_duration_microseconds{handler="prometheus",quantile="0.99"}
+http_request_duration_microseconds_sum{handler="prometheus"}
+http_request_duration_microseconds_count{handler="prometheus"}
+
+# name: "http_request_size_bytes"
+# description: "The HTTP request sizes in bytes."
+# type: "summary"
+http_request_size_bytes{handler="prometheus",quantile="0.5"}
+http_request_size_bytes{handler="prometheus",quantile="0.9"}
+http_request_size_bytes{handler="prometheus",quantile="0.99"}
+http_request_size_bytes_sum{handler="prometheus"}
+http_request_size_bytes_count{handler="prometheus"}
+
+# name: "http_response_size_bytes"
+# description: "The HTTP response sizes in bytes."
+# type: "summary"
+http_response_size_bytes{handler="prometheus",quantile="0.5"}
+http_response_size_bytes{handler="prometheus",quantile="0.9"}
+http_response_size_bytes{handler="prometheus",quantile="0.99"}
+http_response_size_bytes_sum{handler="prometheus"}
+http_response_size_bytes_count{handler="prometheus"}
+