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Document dynamic cardinality enforcement (KEP 2305) #41998

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Nov 28, 2023
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Document dynamic cardinality enforcement (KEP 2305) #41998

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17 changes: 15 additions & 2 deletions content/en/docs/concepts/cluster-administration/system-metrics.md
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Expand Up @@ -202,10 +202,23 @@ Here is an example:
--allow-label-value number_count_metric,odd_number='1,3,5', number_count_metric,even_number='2,4,6', date_gauge_metric,weekend='Saturday,Sunday'
```

In addition to specifying this from the CLI, this can also be done within a configuration file. You
can specify the path to that configuration file using the `--allow-metric-labels-manifest` command
line argument to a component. Here's an example of the contents of that configuration file:

```yaml
allow-list:
- "metric1,label2": "v1,v2,v3"
- "metric2,label1": "v1,v2,v3"
```

Additionally, the `cardinality_enforcement_unexpected_categorizations_total` meta-metric records the
count of unexpected categorizations during cardinality enforcement, that is, whenever a label value
is encountered that is not allowed with respect to the allow-list contraints.

## {{% heading "whatsnext" %}}

* Read about the [Prometheus text format](https://github.com/prometheus/docs/blob/master/content/docs/instrumenting/exposition_formats.md#text-based-format)
for metrics
* See the list of [stable Kubernetes metrics](https://github.com/kubernetes/kubernetes/blob/master/test/instrumentation/testdata/stable-metrics-list.yaml)
* Read about the [Kubernetes deprecation policy](/docs/reference/using-api/deprecation-policy/#deprecating-a-feature-or-behavior)

* Read about the [Kubernetes deprecation policy](/docs/reference/using-api/deprecation-policy/#deprecating-a-feature-or-behavior)