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docs: make phrase about dedup and evaluation interval relation less obscure (#4781)

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Value of `-dedup.minScrapeInterval` comand-line flag must be higher than `evaluation_interval` in order to make sure that only one sample on each evaluation will be left after deduplication.
Moreover, value of `-dedup.minScrapeInterval` must be a multiple of vmalert's `evaluation_interval` in order to make sure that samples will be aligned between deduplication window periods.

See: https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4774#issuecomment-1663940811

Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com>
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Zakhar Bessarab 2023-08-03 19:04:19 +04:00 committed by Aliaksandr Valialkin
parent 05b4fbf0b5
commit 0747ca0595
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2
app/vmalert/README.md
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@ -519,7 +519,7 @@ Alertmanagers.
To avoid recording rules results and alerts state duplication in VictoriaMetrics server
don't forget to configure [deduplication](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#deduplication).
The recommended value for `-dedup.minScrapeInterval` must be greater or equal to vmalert `evaluation_interval`.
The recommended value for `-dedup.minScrapeInterval` must be multiple of vmalert's `evaluation_interval`.
If you observe inconsistent or "jumping" values in series produced by vmalert, try disabling `-datasource.queryTimeAlignment`
command line flag. Because of alignment, two or more vmalert HA pairs will produce results with the same timestamps.
But due of backfilling (data delivered to the datasource with some delay) values of such results may differ,

2
docs/vmalert.md
View file

@ -530,7 +530,7 @@ Alertmanagers.
To avoid recording rules results and alerts state duplication in VictoriaMetrics server
don't forget to configure [deduplication](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#deduplication).
The recommended value for `-dedup.minScrapeInterval` must be greater or equal to vmalert `evaluation_interval`.
The recommended value for `-dedup.minScrapeInterval` must be multiple of vmalert's `evaluation_interval`.
If you observe inconsistent or "jumping" values in series produced by vmalert, try disabling `-datasource.queryTimeAlignment`
command line flag. Because of alignment, two or more vmalert HA pairs will produce results with the same timestamps.
But due of backfilling (data delivered to the datasource with some delay) values of such results may differ,