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mvcc/backend: document metrics ExponentialBuckets 

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>
release-3.4
Gyuho Lee 2018-05-23 12:14:43 -07:00
parent 58e3ead219
commit 60a9ec8a15
1 changed files with 7 additions and 2 deletions
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9
mvcc/backend/metrics.go
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@ -22,7 +22,10 @@ var (
Subsystem: "disk",
Name: "backend_commit_duration_seconds",
Help: "The latency distributions of commit called by backend.",
Buckets: prometheus.ExponentialBuckets(0.001, 2, 14),
// lowest bucket start of upper bound 0.001 sec (1 ms) with factor 2
// highest bucket start of 0.001 sec * 2^13 == 8.192 sec
Buckets: prometheus.ExponentialBuckets(0.001, 2, 14),
})
snapshotDurations = prometheus.NewHistogram(prometheus.HistogramOpts{
@ -30,7 +33,9 @@ var (
Subsystem: "disk",
Name: "backend_snapshot_duration_seconds",
Help: "The latency distribution of backend snapshots.",
// 10 ms -> 655 seconds
// lowest bucket start of upper bound 0.01 sec (10 ms) with factor 2
// highest bucket start of 0.01 sec * 2^16 == 655.36 sec
Buckets: prometheus.ExponentialBuckets(.01, 2, 17),
})
)