- When the kubelet is watching a ConfigMap or Secret purely in the context of setting environment variables
  for containers, only hold that watch for a defined duration before cancelling it. This change reduces the CPU
  and memory usage of the kube-apiserver in large clusters. ([#99393](https://github.com/kubernetes/kubernetes/pull/99393), [@chenyw1990](https://github.com/chenyw1990)) [SIG API Machinery, Node and Testing]

- Kube-controller-manager: increased the global level for broadcaster's logging to 3 so that users can ignore event messages by lowering the logging level. It reduces information noise. ([#122293](https://github.com/kubernetes/kubernetes/pull/122293), [@mengjiao-liu](https://github.com/mengjiao-liu))

* The dynamic Kubelet config feature will now update the config in the event of a ConfigMap mutation, which reduces the chance for silent config skew. Only name, namespace, and kubeletConfigKey may now be set in `Node.Spec.ConfigSource.ConfigMap`. The least disruptive pattern for config management is still to create a new ConfigMap and incrementally roll out a...

* Add /bin/tee symlink to bazel build for busybox, so that CI builds have /bin/tee ([#55417](https://github.com/kubernetes/kubernetes/pull/55417), [@justinsb](https://github.com/justinsb))
* Reduce log noise produced by prometheus-to-sd, by bumping it to version 0.2.2. ([#54635](https://github.com/kubernetes/kubernetes/pull/54635), [@loburm](https://github.com/loburm))

- The `gcp` and `azure` auth plugins have been removed from `client-go` and `kubectl`. See [kubelogin](https://github.com/Azure/kubelogin) and [Kubectl Auth Changes in GKE](https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke) for details about the cloud-specific replacements. ([#112341](https://github.com/kubernetes/kubernetes/pull/112341), [@enj](https://github.com/enj))

### API Change

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- Update the system-validators library to v1.8.0 ([#114060](https://github.com/kubernetes/kubernetes/pull/114060), [@pacoxu](https://github.com/pacoxu)) [SIG Cluster Lifecycle]
- [aws] Fixed a bug which reduces the number of unnecessary calls to STS in the event of assume role failures in the legacy cloud provider ([#110706](https://github.com/kubernetes/kubernetes/pull/110706), [@prateekgogia](https://github.com/prateekgogia)) [SIG Cloud Provider]

### Immutable Secrets and ConfigMaps (beta)

Secret and ConfigMap volumes can be marked as immutable, which significantly reduces load on the API server if there are many Secret and ConfigMap volumes in the cluster.