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prober: migrate to Prometheus metric library

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This provides an example of using native Prometheus metrics with tsweb.

Prober library seems to be the only user of PrometheusVar, so I am
removing support for it in tsweb.

Updates https://github.com/tailscale/corp/issues/10205

Signed-off-by: Anton Tolchanov <anton@tailscale.com>
This commit is contained in:
Anton Tolchanov
2023-04-03 11:35:12 +01:00
committed by Anton Tolchanov
parent 11e6247d2a
commit c153e6ae2f
5 changed files with 122 additions and 230 deletions
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12
tsweb/tsweb.go
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@ -448,15 +448,6 @@ func Error(code int, msg string, err error) HTTPError {
return HTTPError{Code: code, Msg: msg, Err: err}
}
// PrometheusVar is a value that knows how to format itself into
// Prometheus metric syntax.
type PrometheusVar interface {
// WritePrometheus writes the value of the var to w, in Prometheus
// metric syntax. All variables names written out must start with
// prefix (or write out a single variable named exactly prefix)
WritePrometheus(w io.Writer, prefix string)
}
// WritePrometheusExpvar writes kv to w in Prometheus metrics format.
//
// See VarzHandler for conventions. This is exported primarily for
@ -510,9 +501,6 @@ func writePromExpVar(w io.Writer, prefix string, kv expvar.KeyValue) {
name, typ, label := prometheusMetric(prefix, key)
switch v := kv.Value.(type) {
case PrometheusVar:
v.WritePrometheus(w, name)
return
case *expvar.Int:
if typ == "" {
typ = "counter"