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Enable Prometheus native histograms (#6524)

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Add a NativeHistogramBucketFactor parameter to the use of
`NewHistogramVec` in order to enable use of Prometheus Native
Histograms.

This will store automatically computed sparse buckets in CoreDNS.
If a compatible Prometeus requests native histograms this data will
returned instead of the static buckets.

The default factor of 1.05 should provide high quality resolution data.

Signed-off-by: SuperQ <superq@gmail.com>
This commit is contained in:
Ben Kochie
2024-03-11 21:09:09 +01:00
committed by GitHub
parent a4cbd95795
commit 0d6e113f90
7 changed files with 55 additions and 42 deletions
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11
plugin/grpc/metrics.go
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@@ -22,10 +22,11 @@ var (
Help: "Counter of requests made per upstream.",
}, []string{"rcode", "to"})
RequestDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
Namespace: plugin.Namespace,
Subsystem: "grpc",
Name: "request_duration_seconds",
Buckets: plugin.TimeBuckets,
Help: "Histogram of the time each request took.",
Namespace: plugin.Namespace,
Subsystem: "grpc",
Name: "request_duration_seconds",
Buckets: plugin.TimeBuckets,
NativeHistogramBucketFactor: plugin.NativeHistogramBucketFactor,
Help: "Histogram of the time each request took.",
}, []string{"to"})
)