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docs: mention staleNaN handling during deduplication

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See https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5587

Signed-off-by: hagen1778 <roman@victoriametrics.com>
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Artem Navoiev 2024-01-08 20:20:09 +01:00 committed by hagen1778
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3
README.md
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@ -1767,6 +1767,9 @@ This aligns with the [staleness rules in Prometheus](https://prometheus.io/docs/
If multiple raw samples have **the same timestamp** on the given `-dedup.minScrapeInterval` discrete interval,
then the sample with **the biggest value** is kept.
Prometheus stale markers are respected as any other value. If raw sample with the biggest timestamp on `-dedup.minScrapeInterval`
has a stale marker as a value - it will be kept after the deduplication.
Please note, [labels](https://docs.victoriametrics.com/keyConcepts.html#labels) of raw samples should be identical
in order to be deduplicated. For example, this is why [HA pair of vmagents](https://docs.victoriametrics.com/vmagent.html#high-availability)
needs to be identically configured.

2
lib/storage/dedup.go
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@ -25,6 +25,8 @@ func isDedupEnabled() bool {
}
// DeduplicateSamples removes samples from src* if they are closer to each other than dedupInterval in milliseconds.
// DeduplicateSamples treats StaleNaN (Prometheus stale markers) as values and doesn't skip them on purpose - see
// https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5587
func DeduplicateSamples(srcTimestamps []int64, srcValues []float64, dedupInterval int64) ([]int64, []float64) {
if !needsDedup(srcTimestamps, dedupInterval) {
// Fast path - nothing to deduplicate