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Docs: Hint about potential high cardinality metrics #5603

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May 20, 2022
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Docs: Hint about potential high cardinality metrics #5603

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Hint about potential high cardinality metrics
m1keil Mar 11, 2022
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Reword observability.md
m1keil Mar 30, 2022
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7 changes: 7 additions & 0 deletions docs/sources/operations/observability.md
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Expand Up @@ -82,6 +82,13 @@ exposed by Promtail at its `/metrics` endpoint. See Promtail's documentation on
An example Grafana dashboard was built by the community and is available as
dashboard [10004](https://grafana.com/dashboards/10004).

## Metrics cardinality

Some of the metrics above are emitted per tracked file (active) with the file path included in the labels.
Depending on your setup, this may result in very large amount of label values across the environment (cardinality). This is generally discouraged by [Prometheus](https://prometheus.io/docs/practices/naming/#labels) and may result with unwanted side effects.
Make sure to review the emitted metrics before starting scraping with Prometheus and config the scraping accordingly if you suspect this might be an issue.
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## Mixins

The Loki repository has a [mixin](https://github.com/grafana/loki/blob/master/production/loki-mixin) that includes a
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