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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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33
plugin/metrics/vars/vars.go
View File

@@ -17,19 +17,21 @@ var (
}, []string{"server", "zone", "view", "proto", "family", "type"})
RequestDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
Namespace: plugin.Namespace,
Subsystem: subsystem,
Name: "request_duration_seconds",
Buckets: plugin.TimeBuckets,
Help: "Histogram of the time (in seconds) each request took per zone.",
Namespace: plugin.Namespace,
Subsystem: subsystem,
Name: "request_duration_seconds",
Buckets: plugin.TimeBuckets,
NativeHistogramBucketFactor: plugin.NativeHistogramBucketFactor,
Help: "Histogram of the time (in seconds) each request took per zone.",
}, []string{"server", "zone", "view"})
RequestSize = promauto.NewHistogramVec(prometheus.HistogramOpts{
Namespace: plugin.Namespace,
Subsystem: subsystem,
Name: "request_size_bytes",
Help: "Size of the EDNS0 UDP buffer in bytes (64K for TCP) per zone and protocol.",
Buckets: []float64{0, 100, 200, 300, 400, 511, 1023, 2047, 4095, 8291, 16e3, 32e3, 48e3, 64e3},
Namespace: plugin.Namespace,
Subsystem: subsystem,
Name: "request_size_bytes",
Help: "Size of the EDNS0 UDP buffer in bytes (64K for TCP) per zone and protocol.",
Buckets: []float64{0, 100, 200, 300, 400, 511, 1023, 2047, 4095, 8291, 16e3, 32e3, 48e3, 64e3},
NativeHistogramBucketFactor: plugin.NativeHistogramBucketFactor,
}, []string{"server", "zone", "view", "proto"})
RequestDo = promauto.NewCounterVec(prometheus.CounterOpts{
@@ -40,11 +42,12 @@ var (
}, []string{"server", "zone", "view"})
ResponseSize = promauto.NewHistogramVec(prometheus.HistogramOpts{
Namespace: plugin.Namespace,
Subsystem: subsystem,
Name: "response_size_bytes",
Help: "Size of the returned response in bytes.",
Buckets: []float64{0, 100, 200, 300, 400, 511, 1023, 2047, 4095, 8291, 16e3, 32e3, 48e3, 64e3},
Namespace: plugin.Namespace,
Subsystem: subsystem,
Name: "response_size_bytes",
Help: "Size of the returned response in bytes.",
Buckets: []float64{0, 100, 200, 300, 400, 511, 1023, 2047, 4095, 8291, 16e3, 32e3, 48e3, 64e3},
NativeHistogramBucketFactor: plugin.NativeHistogramBucketFactor,
}, []string{"server", "zone", "view", "proto"})
ResponseRcode = promauto.NewCounterVec(prometheus.CounterOpts{