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Fix double-counting bug in http_request_duration metric #6399

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merged 2 commits into from May 30, 2023
Merged

Fix double-counting bug in http_request_duration metric #6399

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bf3cd8e
fix double-counting bug in http_request_duration metric
4orty May 29, 2023
f059a14
Update Changelog
4orty May 30, 2023
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1 change: 1 addition & 0 deletions CHANGELOG.md
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Expand Up @@ -34,6 +34,7 @@ We use *breaking :warning:* to mark changes that are not backward compatible (re
- [#6330](https://github.com/thanos-io/thanos/pull/6330) Store: Fix inconsistent error for series limits.
- [#6342](https://github.com/thanos-io/thanos/pull/6342) Cache/Redis: Upgrade `rueidis` to v1.0.2 to to improve error handling while shrinking a redis cluster.
- [#6325](https://github.com/thanos-io/thanos/pull/6325) Store: return gRPC resource exhausted error for byte limiter.
- [#6399](https://github.com/thanos-io/thanos/pull/6399) *: Fix double-counting bug in http_request_duration metric

### Changed
- [#6168](https://github.com/thanos-io/thanos/pull/6168) Receiver: Make ketama hashring fail early when configured with number of nodes lower than the replication factor.
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6 changes: 4 additions & 2 deletions pkg/extprom/http/instrument_server.go
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Expand Up @@ -76,7 +76,7 @@ func httpInstrumentationHandler(baseLabels prometheus.Labels, metrics *defaultMe

requestLabels := prometheus.Labels{"code": wd.Status(), "method": strings.ToLower(r.Method)}
observer := metrics.requestDuration.MustCurryWith(baseLabels).With(requestLabels)
observer.Observe(time.Since(now).Seconds())
requestDuration := time.Since(now).Seconds()

// If we find a tracingID we'll expose it as Exemplar.
var (
Expand Down Expand Up @@ -104,11 +104,13 @@ func httpInstrumentationHandler(baseLabels prometheus.Labels, metrics *defaultMe

if traceID != "" {
observer.(prometheus.ExemplarObserver).ObserveWithExemplar(
time.Since(now).Seconds(),
requestDuration,
prometheus.Labels{
"traceID": traceID,
},
)
} else {
observer.Observe(requestDuration)
}
}),
),
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