Reinstate PodAndContainerStatsFromCRI docs

Previous changes lost this documentation; reinstate something similar.

Author: Tim Bannister

content/en/docs/tasks/debug/debug-cluster/resource-metrics-pipeline.md

@@ -270,6 +270,17 @@ Beginning with `metrics-server` 0.6.x, `metrics-server` queries the `/metrics/re
 kubelet endpoint, and not `/stats/summary`.
 {{< /note >}}
 
+### Summary metrics API source {#summary-api-source}
 
 By default, Kubernetes fetches node summary metrics data using an embedded
 [cAdvisor](https://github.com/google/cadvisor) that runs with in the kubelet.
+
+### Summary API data via CRI {#pod-and-container-stats-from-cri}
+
+{{< feature-state for_k8s_version="v1.23" state="alpha" >}}
+
+If you enable the `PodAndContainerStatsFromCRI`
+[feature gate](/docs/reference/command-line-tools-reference/feature-gates/) in your
+cluster, and you use a container runtime that supports statistics access via
+{{< glossary_tooltip term_id="cri" text="Container Runtime Interface">}} (CRI), then
+the kubelet fetches Pod- and container-level metric data using CRI, and not via cadvisor.