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package proxy
import (
"sync"
"github.com/coredns/coredns/middleware"
"github.com/prometheus/client_golang/prometheus"
)
// Metrics the proxy middleware exports.
var (
RequestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: middleware.Namespace,
Subsystem: "proxy",
Name: "request_duration_milliseconds",
Buckets: append(prometheus.DefBuckets, []float64{50, 100, 200, 500, 1000, 2000, 3000, 4000, 5000, 10000}...),
Help: "Histogram of the time (in milliseconds) each request took.",
}, []string{"proto", "proxy_proto", "from"})
)
// OnStartupMetrics sets up the metrics on startup. This is done for all proxy protocols.
func OnStartupMetrics() error {
metricsOnce.Do(func() {
prometheus.MustRegister(RequestDuration)
})
return nil
}
var metricsOnce sync.Once
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