String INDEX_USER_initial_password = "index.user.initial_password";

    /** The key of the configuration. e.g. favorite_count */
    String INDEX_FIELD_favorite_count = "index.field.favorite_count";

    /** The key of the configuration. e.g. click_count */
    String INDEX_FIELD_click_count = "index.field.click_count";

    /** The key of the configuration. e.g. config_id */
    String INDEX_FIELD_config_id = "index.field.config_id";

- Following metrics from kube-controller-manager are now marked as with the ALPHA stability level:
  `storage_count_attachable_volumes_in_use`
  `attachdetach_controller_total_volumes`
  `pv_collector_bound_pv_count`
  `pv_collector_unbound_pv_count`
  `pv_collector_bound_pvc_count`
  `pv_collector_unbound_pvc_count`
  ([#84896](https://github.com/kubernetes/kubernetes/pull/84896), [@RainbowMango](https://github.com/RainbowMango))

        * `apiserver_request_count`
        * `apiserver_request_latencies`
        * `apiserver_request_latencies_summary`
        * `apiserver_dropped_requests`
        * `etcd_helper_cache_hit_count`
        * `etcd_helper_cache_miss_count`
        * `etcd_helper_cache_entry_count`
        * `etcd_request_cache_get_latencies_summary`

implementation is changed to not return an error when the specified target can be detected as not a mount point. On Linux, the behavior of detecting a mount point depends on `umount` command is validated when the mounter is created. Additionally, mount point checks will be skipped in CleanupMountPoint/CleanupMountWithForce if the mounter's Unmount having the changed behavior of not returning error when target is not a mount point. ([#109676](https://github.com/kubernetes/kubernetes/pull/109676), [@cartermckin...

* Add `container_state` label to `running_container_count` kubelet metrics, to get count of containers based on their state(running/exited/created/unknown) ([#81573](https://github.com/kubernetes/kubernetes/pull/81573),...

    * --alpha-endpoint-reconciler-type=(master-count, lease, none) (default
    * "master-count"). The original reconciler is 'master-count'. The 'lease'
    * reconciler uses the storageapi and a TTL to keep alive an endpoint within the
    * `kube-apiserver-endpoint` storage namespace. The 'none' reconciler is a noop

- Exposed CSI volume stats via kubelet volume metrics ([#76188](https://github.com/kubernetes/kubernetes/pull/76188), [@humblec](https://github.com/humblec))
- Added a new `storage_operation_status_count` metric for kube-controller-manager and kubelet to count success and error statues. ([#75750](https://github.com/kubernetes/kubernetes/pull/75750), [@msau42](https://github.com/msau42))

### Deprecated/changed metrics

- Rename metrics `etcd_object_counts` to `apiserver_storage_object_counts` and mark it as stable. The original `etcd_object_counts` metrics name is marked as "Deprecated" and will be removed in the future. ([#99785](https://github.com/kubernetes/kubernetes/pull/99785), [@erain](https://github.com/erain)) [SIG API Machinery, Instrumentation...

- AzureFile and CephFS use the new Mount library that prevents logging of sensitive mount options. ([#88684](https://github.com/kubernetes/kubernetes/pull/88684), [@saad-ali](https://github.com/saad-ali)) [SIG Storage]

- There is a new pv_collector_total_pv_count metric that counts persistent volumes by the volume plugin name and volume mode. ([#95719](https://github.com/kubernetes/kubernetes/pull/95719), [@tsmetana](https://github.com/tsmetana)) [SIG Apps, Instrumentation, Storage and Testing]