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docs/vmagent.md: clarify how -promscrape.seriesLimitPerTarget command-line flag, series_limit config option and __series_limit__ label interact with each other

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This is a follow-up for https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5663
See also 89e3c70ccd
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Aliaksandr Valialkin 2024-01-23 13:14:46 +02:00
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@ -969,14 +969,17 @@ must be enabled on all the configured remote storage systems.
By default, `vmagent` doesn't limit the number of time series each scrape target can expose.
The limit can be enforced in the following places:
* Via `-promscrape.seriesLimitPerTarget` command-line option. This limit is applied individually
* Via `-promscrape.seriesLimitPerTarget` command-line flag. This limit is applied individually
to all the scrape targets defined in the file pointed by `-promscrape.config`.
* Via `series_limit` config option at [scrape_config](https://docs.victoriametrics.com/sd_configs.html#scrape_configs) section.
This limit is applied individually to all the scrape targets defined in the given `scrape_config`.
The `series_limit` allows overriding the `-promscrape.seriesLimitPerTarget` on a per-`scrape_config` basis.
If `series_limit` is set to `0` or to negative value, then it isn't applied to the given `scrape_config`,
even if `-promscrape.seriesLimitPerTarget` command-line flag is set.
* Via `__series_limit__` label, which can be set with [relabeling](#relabeling) at `relabel_configs` section.
This limit is applied to the corresponding scrape targets. Typical use case: to set the limit
via [Kubernetes annotations](https://kubernetes.io/docs/concepts/overview/working-with-objects/annotations/) for targets,
which may expose too high number of time series.
The `__series_limit__` allows overriding the `series_limit` on a per-target basis.
If `__series_limit__` is set to `0` or to negative value, then it isn't applied to the given target.
Typical use case: to set the limit via [Kubernetes annotations](https://kubernetes.io/docs/concepts/overview/working-with-objects/annotations/)
for targets, which may expose too high number of time series.
Scraped metrics are dropped for time series exceeding the given limit on the time window of 24h.
`vmagent` creates the following additional per-target metrics for targets with non-zero series limit: