TheArchive/tailscale
1
0
Fork 0
mirror of https://github.com/tailscale/tailscale.git synced 2025-08-22 11:01:54 +00:00
Code Issues Packages Projects Releases Wiki Activity

metrics: add a LabelMap type for variables with 1 label dimension.

Browse Source 
This lets us publish sets of vars that are breakdowns along one
dimension in a format that Prometheus and Grafana natively know
how to do useful things with.

Signed-off-by: David Anderson <dave@natulte.net>
This commit is contained in:
David Anderson
2020-03-04 12:24:07 -08:00
committed by Dave Anderson
parent eac62ec5ff
commit f192c05413
3 changed files with 72 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
tsweb/tsweb.go
View File

@@ -156,26 +156,39 @@ func varzHandler(w http.ResponseWriter, r *http.Request) {
})
return
}
if strings.HasPrefix(kv.Key, "gauge_") {
switch {
case strings.HasPrefix(kv.Key, "gauge_"):
typ = "gauge"
name = prefix + strings.TrimPrefix(kv.Key, "gauge_")
} else if strings.HasPrefix(kv.Key, "counter_") {
case strings.HasPrefix(kv.Key, "counter_"):
typ = "counter"
name = prefix + strings.TrimPrefix(kv.Key, "counter_")
}
if fn, ok := kv.Value.(expvar.Func); ok {
val := fn()
switch val.(type) {
case int64, int:
if typ != "" {
fmt.Fprintf(w, "# TYPE %s %s\n%s %v\n", name, typ, name, val)
return
}
}
fmt.Fprintf(w, "# skipping expvar func %q returning unknown type %T\n", name, val)
default:
fmt.Fprintf(w, "# skipping expvar %q with undeclared Prometheus type\n", name)
return
}
fmt.Fprintf(w, "# skipping func %q returning unknown type %T\n", name, kv.Value)
switch v := kv.Value.(type) {
case expvar.Func:
val := v()
switch val.(type) {
case int64, int:
fmt.Fprintf(w, "# TYPE %s %s\n%s %v\n", name, typ, name, val)
default:
fmt.Fprintf(w, "# skipping expvar func %q returning unknown type %T\n", name, val)
}
case *metrics.LabelMap:
fmt.Fprintf(w, "# TYPE %s %s\n", name, typ)
// IntMap uses expvar.Map on the inside, which presorts
// keys. The output ordering is deterministic.
v.Do(func(kv expvar.KeyValue) {
fmt.Fprintf(w, "%s{%s=%s} %v\n", name, v.Label, kv.Key, kv.Value)
})
}
}
expvar.Do(func(kv expvar.KeyValue) {
dump("", kv)