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metrics, tsweb/varz: add multi-label map metrics

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Updates tailscale/corp#18640

Change-Id: Ia9ae25956038e9d3266ea165537ac6f02485b74c
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-03-25 15:40:45 -07:00
committed by Brad Fitzpatrick
parent 90a4d6ce69
commit 55baf9474f
4 changed files with 408 additions and 0 deletions
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11
tsweb/varz/varz.go
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@@ -133,6 +133,9 @@ func writePromExpVar(w io.Writer, prefix string, kv expvar.KeyValue) {
writePromExpVar(w, name+"_", kv)
})
return
case PrometheusWriter:
v.WritePrometheus(w, name)
return
case PrometheusMetricsReflectRooter:
root := v.PrometheusMetricsReflectRoot()
rv := reflect.ValueOf(root)
@@ -233,6 +236,14 @@ func writePromExpVar(w io.Writer, prefix string, kv expvar.KeyValue) {
}
}
// PrometheusWriter is the interface implemented by metrics that can write
// themselves into Prometheus exposition format.
//
// As of 2024-03-25, this is only *metrics.MultiLabelMap.
type PrometheusWriter interface {
WritePrometheus(w io.Writer, name string)
}
var sortedKVsPool = &sync.Pool{New: func() any { return new(sortedKVs) }}
// sortedKV is a KeyValue with a sort key.