54964653d1
Add a separate request duration metrics specially for proxying requests upstream. Fixes #259
32 lines
774 B
Go
32 lines
774 B
Go
package proxy
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import (
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"sync"
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"github.com/miekg/coredns/middleware"
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"github.com/prometheus/client_golang/prometheus"
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)
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// Metrics the proxy middleware exports.
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var (
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RequestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
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Namespace: middleware.Namespace,
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Subsystem: subsystem,
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Name: "request_duration_milliseconds",
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Buckets: append(prometheus.DefBuckets, []float64{50, 100, 200, 500, 1000, 2000, 3000, 4000, 5000, 10000}...),
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Help: "Histogram of the time (in milliseconds) each request took.",
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}, []string{"zone"})
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)
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// OnStartup sets up the metrics on startup.
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func OnStartup() error {
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metricsOnce.Do(func() {
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prometheus.MustRegister(RequestDuration)
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})
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return nil
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}
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var metricsOnce sync.Once
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const subsystem = "proxy"
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