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docs/vmagent.md: sync with app/vmagent/README.md by running make docs-sync

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Aliaksandr Valialkin 2021-09-11 11:04:42 +03:00
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@ -296,7 +296,15 @@ You can read more about relabeling in the following articles:
## Prometheus staleness markers
Starting from [v1.64.0](https://docs.victoriametrics.com/CHANGELOG.html#v1640), `vmagent` sends [Prometheus staleness markers](https://www.robustperception.io/staleness-and-promql) for scraped metrics when the scrape target is removed from the list of targets. Prometheus staleness markers aren't sent in [stream parsing mode](#stream-parsing-mode) or if `-promscrape.noStaleMarkers` command-line is set.
`vmagent` sends [Prometheus staleness markers](https://www.robustperception.io/staleness-and-promql) to `-remoteWrite.url` in the following cases:
* If they are passed to `vmagent` via [Prometheus remote_write protocol](#prometheus-remote_write-proxy).
* If the metric disappears from the list of scraped metrics, then stale marker is sent to this particular metrics.
* If the scrape target becomes temporarily unavailable, then stale markers are sent for all the metrics scraped from this target.
* If the scrape target is removed from the list of targets, then stale markers are sent for all the metrics scraped from this target.
* Stale markers are sent for all the scraped metrics on graceful shutdown of `vmagent`.
Prometheus staleness markers aren't sent in [stream parsing mode](#stream-parsing-mode) or if `-promscrape.noStaleMarkers` command-line is set.
## Stream parsing mode