123a76c91e
* middleware/proxy: absorb httpproxy Move the httproxy into proxy. This adds and Exchanger interface which is used to exchange the messages with the upstream. The https_google upstream will re-resolve itself and update the upstream hosts used every 300s. * Remove and add TODO
30 lines
806 B
Go
30 lines
806 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: "proxy",
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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{"proto", "from"})
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)
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// OnStartupMetrics sets up the metrics on startup. This is done for all proxy protocols.
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func OnStartupMetrics() 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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