- Kubelet: Fix the volume manager didn't check the device mount state in the actual state of the world before marking the volume as detached. It may cause a pod to be stuck in the Terminating state due to the above issue when it was deleted. ([#129062](https://github.com/kubernetes/kubernetes/pull/129062), [@carlory](https://github.com/carlory)) [SIG Node]

    - [Immutable Secrets and ConfigMaps](#immutable-secrets-and-configmaps)
    - [Structured Logging in Kubelet](#structured-logging-in-kubelet)
    - [Storage Capacity Tracking](#storage-capacity-tracking)
    - [Generic Ephemeral Volumes](#generic-ephemeral-volumes)
    - [CSI Service Account Token](#csi-service-account-token)
    - [CSI Health Monitoring](#csi-health-monitoring)

#### kube-apiserver:
- in an `--encryption-provider-config` config file, an explicit `cacheSize: 0` parameter previously silently defaulted to caching 1000 keys. In Kubernetes 1.18, this now returns a config validation error. To disable caching, you can specify a negative cacheSize value in Kubernetes 1.18+.

     * comment: Whether to enable click count tracking in the indexer.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexerClickCountEnabled();

    /**
     * Is the property for the key 'indexer.click.count.enabled' true? <br>
     * The value is, e.g. true <br>
     * comment: Whether to enable click count tracking in the indexer.