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docs/vmalert: clarify deduplication recommendations for HA setup (#5336)

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Please see discussion here https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5279

Signed-off-by: hagen1778 <roman@victoriametrics.com>
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Roman Khavronenko 2023-11-16 16:26:57 +01:00 committed by Aliaksandr Valialkin
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14
app/vmalert/README.md
View File

@ -542,10 +542,20 @@ Alertmanagers.
To avoid recording rules results and alerts state duplication in VictoriaMetrics server 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). don't forget to configure [deduplication](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#deduplication).
The recommended value for `-dedup.minScrapeInterval` must be multiple of vmalert's `-evaluationInterval`. Multiple equally configured vmalerts should evaluate rules at the same timestamps, so it is recommended
to set `-dedup.minScrapeInterval` as equal to vmalert's `-evaluationInterval`.
If you have multiple different `interval` params for distinct rule groups, then set `-dedup.minScrapeInterval` to
the biggest `interval` value, or value which will be a multiple for all `interval` values. For example, if you have
two groups with `interval: 10s` and `interval: 15s`, then set `-dedup.minScrapeInterval=30s`. This would consistently
keep only a single data point on 30s time interval for all rules. However, try to avoid having inconsistent `interval`
values.
It is not recommended having `-dedup.minScrapeInterval` smaller than `-evaluationInterval`, as it may produce
results with inconsistent intervals between data points.
Alertmanager will automatically deduplicate alerts with identical labels, so ensure that Alertmanager will automatically deduplicate alerts with identical labels, so ensure that
all `vmalert`s are having the same config. all `vmalert`s are having identical config.
Don't forget to configure [cluster mode](https://prometheus.io/docs/alerting/latest/alertmanager/) Don't forget to configure [cluster mode](https://prometheus.io/docs/alerting/latest/alertmanager/)
for Alertmanagers for better reliability. List all Alertmanager URLs in vmalert `-notifier.url` for Alertmanagers for better reliability. List all Alertmanager URLs in vmalert `-notifier.url`

14
docs/vmalert.md
View File

@ -553,10 +553,20 @@ Alertmanagers.
To avoid recording rules results and alerts state duplication in VictoriaMetrics server 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). don't forget to configure [deduplication](https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#deduplication).
The recommended value for `-dedup.minScrapeInterval` must be multiple of vmalert's `-evaluationInterval`. Multiple equally configured vmalerts should evaluate rules at the same timestamps, so it is recommended
to set `-dedup.minScrapeInterval` as equal to vmalert's `-evaluationInterval`.
If you have multiple different `interval` params for distinct rule groups, then set `-dedup.minScrapeInterval` to
the biggest `interval` value, or value which will be a multiple for all `interval` values. For example, if you have
two groups with `interval: 10s` and `interval: 15s`, then set `-dedup.minScrapeInterval=30s`. This would consistently
keep only a single data point on 30s time interval for all rules. However, try to avoid having inconsistent `interval`
values.
It is not recommended having `-dedup.minScrapeInterval` smaller than `-evaluationInterval`, as it may produce
results with inconsistent intervals between data points.
Alertmanager will automatically deduplicate alerts with identical labels, so ensure that Alertmanager will automatically deduplicate alerts with identical labels, so ensure that
all `vmalert`s are having the same config. all `vmalert`s are having identical config.
Don't forget to configure [cluster mode](https://prometheus.io/docs/alerting/latest/alertmanager/) Don't forget to configure [cluster mode](https://prometheus.io/docs/alerting/latest/alertmanager/)
for Alertmanagers for better reliability. List all Alertmanager URLs in vmalert `-notifier.url` for Alertmanagers for better reliability. List all Alertmanager URLs in vmalert `-notifier.url`