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prober: export a metric with the number of in-flight probes

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Updates tailscale/corp#37049

Signed-off-by: Anton Tolchanov <anton@tailscale.com>
This commit is contained in:
Anton Tolchanov
2026-02-10 19:25:50 +00:00
committed by Anton Tolchanov
parent 8e39a0aa0f
commit 45db3691b9
2 changed files with 24 additions and 2 deletions
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prober/prober_test.go
+17 -2
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@@ -213,6 +213,14 @@ func TestProberConcurrency(t *testing.T) {
if got, want := ran.Load(), int64(3); got != want {
return fmt.Errorf("expected %d probes to run concurrently, got %d", want, got)
}
wantMetrics := `
# HELP prober_in_flight Number of probes currently running
# TYPE prober_in_flight gauge
prober_in_flight{class="",name="foo"} 3
`
if err := testutil.GatherAndCompare(p.metrics, strings.NewReader(wantMetrics), "prober_in_flight"); err != nil {
return fmt.Errorf("unexpected metrics: %w", err)
}
return nil
}); err != nil {
t.Fatal(err)
@@ -308,9 +316,12 @@ probe_end_secs{class="",label="value",name="testprobe"} %d
# HELP probe_result Latest probe result (1 = success, 0 = failure)
# TYPE probe_result gauge
probe_result{class="",label="value",name="testprobe"} 0
# HELP probe_in_flight Number of probes currently running
# TYPE probe_in_flight gauge
probe_in_flight{class="",label="value",name="testprobe"} 0
`, probeInterval.Seconds(), epoch.Unix(), epoch.Add(aFewMillis).Unix())
return testutil.GatherAndCompare(p.metrics, strings.NewReader(want),
"probe_interval_secs", "probe_start_secs", "probe_end_secs", "probe_result")
"probe_interval_secs", "probe_start_secs", "probe_end_secs", "probe_result", "probe_in_flight")
})
if err != nil {
t.Fatal(err)
@@ -338,9 +349,13 @@ probe_latency_millis{class="",label="value",name="testprobe"} %d
# HELP probe_result Latest probe result (1 = success, 0 = failure)
# TYPE probe_result gauge
probe_result{class="",label="value",name="testprobe"} 1
# HELP probe_in_flight Number of probes currently running
# TYPE probe_in_flight gauge
probe_in_flight{class="",label="value",name="testprobe"} 0
`, probeInterval.Seconds(), start.Unix(), end.Unix(), aFewMillis.Milliseconds())
return testutil.GatherAndCompare(p.metrics, strings.NewReader(want),
"probe_interval_secs", "probe_start_secs", "probe_end_secs", "probe_latency_millis", "probe_result")
"probe_interval_secs", "probe_start_secs", "probe_end_secs",
"probe_latency_millis", "probe_result", "probe_in_flight")
})
if err != nil {
t.Fatal(err)