8000 feat: add path & method labels to prometheus metrics for current requests by ibetitsmike · Pull Request #17362 · coder/coder · GitHub
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feat: add path & method labels to prometheus metrics for current requests #17362

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Merged
merged 7 commits into from
Apr 16, 2025
Merged

feat: add path & method labels to prometheus metrics for current requests #17362

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bf5b3a8
added chi route extraction and labels
ibetitsmike Apr 11, 2025
3ff76bb
added path matching to prometheus middleware
ibetitsmike Apr 14, 2025
d9f3dfa
added method to requests concurrent
ibetitsmike Apr 14, 2025
b3b5b75
added unit tests for the prometheus middleware
ibetitsmike Apr 14, 2025
4d95f4e
unified testing code style
ibetitsmike Apr 15, 2025
2cb3796
PR feedback
ibetitsmike Apr 16, 2025
b68853a
fixed a bug with path matching
ibetitsmike Apr 16, 2025
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added chi route extraction and labels
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@ibetitsmike
ibetitsmike committed Apr 15, 2025
commit bf5b3a8517d9ea719950d206a20dff0fd5b3f6ca
19 changes: 10 additions & 9 deletions coderd/httpmw/prometheus.go
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Original file line number Diff line number Diff line change
Expand Up @@ -22,18 +22,18 @@ func Prometheus(register prometheus.Registerer) func(http.Handler) http.Handler
Name: "requests_processed_total",
Help: "The total number of processed API requests",
}, []string{"code", "method", "path"})
requestsConcurrent := factory.NewGauge(prometheus.GaugeOpts{
requestsConcurrent := factory.NewGaugeVec(prometheus.GaugeOpts{
Namespace: "coderd",
Subsystem: "api",
Name: "concurrent_requests",
Help: "The number of concurrent API requests.",
})
websocketsConcurrent := factory.NewGauge(prometheus.GaugeOpts{
}, []string{"path"})
websocketsConcurrent := factory.NewGaugeVec(prometheus.GaugeOpts{
Namespace: "coderd",
Subsystem: "api",
Name: "concurrent_websockets",
Help: "The total number of concurrent API websockets.",
})
}, []string{"path"})
websocketsDist := factory.NewHistogramVec(prometheus.HistogramOpts{
Namespace: "coderd",
Subsystem: "api",
Expand Down Expand Up @@ -69,27 +69,28 @@ func Prometheus(register prometheus.Registerer) func(http.Handler) http.Handler
panic("dev error: http.ResponseWriter is not *tracing.StatusWriter")
}

path := rctx.RoutePattern()

var (
dist *prometheus.HistogramVec
distOpts []string
)
// We want to count WebSockets separately.
if httpapi.IsWebsocketUpgrade(r) {
websocketsConcurrent.Inc()
defer websocketsConcurrent.Dec()
websocketsConcurrent.WithLabelValues(path).Inc()
defer websocketsConcurrent.WithLabelValues(path).Dec()

dist = websocketsDist
} else {
requestsConcurrent.Inc()
defer requestsConcurrent.Dec()
requestsConcurrent.WithLabelValues(path).Inc()
defer requestsConcurrent.WithLabelValues(path).Dec()

dist = requestsDist
distOpts = []string{method}
}

next.ServeHTTP(w, r)

path := rctx.RoutePattern()
distOpts = append(distOpts, path)
statusStr := strconv.Itoa(sw.Status)

Expand Down
0