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Zach LeslieandGitHub
7d57b262b0
* Use native histogram for blocklist_poll_duration_seconds * Keep default buckets * Add native histogram support to remaining histograms * Update changelog
42 lines
1.2 KiB
Go
42 lines
1.2 KiB
Go
package instrumentation
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import (
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"net/http"
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"strconv"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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)
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var requestDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
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Namespace: "tempodb",
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Name: "backend_request_duration_seconds",
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Help: "Time spent doing backend storage requests.",
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Buckets: prometheus.ExponentialBuckets(0.005, 4, 6),
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NativeHistogramBucketFactor: 1.1,
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NativeHistogramMaxBucketNumber: 100,
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NativeHistogramMinResetDuration: 1 * time.Hour,
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}, []string{"operation", "status_code"})
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type instrumentedTransport struct {
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observer prometheus.ObserverVec
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next http.RoundTripper
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}
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func NewTransport(next http.RoundTripper) http.RoundTripper {
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return instrumentedTransport{
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next: next,
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observer: requestDuration,
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}
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}
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func (i instrumentedTransport) RoundTrip(req *http.Request) (*http.Response, error) {
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start := time.Now()
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resp, err := i.next.RoundTrip(req)
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if err == nil {
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i.observer.WithLabelValues(req.Method, strconv.Itoa(resp.StatusCode)).Observe(time.Since(start).Seconds())
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}
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return resp, err
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}
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