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content/en/docs/concepts/cluster-administration/monitoring.md

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 - RainbowMango
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 System component metrics can give a better look into what is happening inside them. Metrics are particularly useful for building dashboards and alerts.
 
 Metrics in Kubernetes control plane are emitted in [prometheus format](https://prometheus.io/docs/instrumenting/exposition_formats/) and are human readable.
 
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 ## Metrics in Kubernetes
 
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 cloudprovider_gce_api_request_duration_seconds { request = "list_disk"}
 ```
 
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 * 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](https://kubernetes.io/docs/reference/using-api/deprecation-policy/#deprecating-a-feature-or-behavior )
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