- Add `permit_wait_duration_seconds` metric to the scheduler. ([#84011](https://github.com/kubernetes/kubernetes/pull/84011), [@liu-cong](https://github.com/liu-cong))

### Deprecated/changed metrics
- etcd version monitor metrics are now marked as with the ALPHA stability level. ([#83283](https://github.com/kubernetes/kubernetes/pull/83283), [@RainbowMango](https://github.com/RainbowMango))

* **[beta]** Node Problem Detector is beta (v0.3.0) now. New
  features added into node-problem-detector:v0.3.0:
  - Add support for journald.
  - The ability to monitor any system daemon logs. Previously only kernel
    logs were supported.
  - The ability to be deployed and run as a native daemon.
* **[alpha]** Critical Pods: When feature gate "ExperimentalCriticalPodAnnotation" is

- The Kubelet can now monitor the health of devices allocated via Dynamic Resource Allocation (DRA) and report it in the `pod.status.containerStatuses.allocatedResourcesStatus` field. This requires the DRA plugin to implement the new v1alpha1 `NodeHealth` gRPC service. This feature...

    * Add ABRT support. ([#105](https://github.com/kubernetes/node-problem-detector/pull/105), [@juliusmilan](https://github.com/juliusmilan))

    * Add a docker image corruption problem detection in the default docker monitor config. ([#117](https://github.com/kubernetes/node-problem-detector/pull/117), [@ajitak](https://github.com/ajitak))

  * Upgrade CAdvisor to v0.26.1. New features added:

    * Add Docker overlay2 storage driver support.

- The default value for node-monitor-grace-period has been increased to 50s (earlier 40s) (Ref - https://github.com/kubernetes/kubernetes/issues/121793) ([#126287](https://github.com/kubernetes/kubernetes/pull/126287), [@devppratik](https://github.com/devppratik)) [SIG API Machinery,...

* Increase waiting time (120s) for docker startup in health-monitor.sh ([#54099](https://github.com/kubernetes/kubernetes/pull/54099), [@dchen1107](https://github.com/dchen1107))

- Client-go: Optimized leaders renewing leases by updating leader lock optimistically without getting the record from the API server first. Also, a new metric `leader_election_slowpath_total` was added to allow users to monitor how many leader elections are updated non-optimistically.
   ([#122069](https://github.com/kubernetes/kubernetes/pull/122069), [@linxiulei](https://github.com/linxiulei))

  - By default, injected tokens are given an extended lifetime so they remain valid even after a new refreshed token is provided. The metric `serviceaccount_stale_tokens_total` can be used to monitor for workloads that are depending on the extended lifetime and are continuing to use tokens even after a refreshed token is provided to the container. If that metric indicates no existing workloads are depending on extended lifetimes, injected token...

* Bumps version of kubernetes-cni to 0.6.0 ([#71629](https://github.com/kubernetes/kubernetes/pull/71629), [@mauilion](https://github.com/mauilion))
* On GCI, NPD starts to monitor kubelet, docker, containerd crashlooping, read-only filesystem and corrupt docker overlay2 issues. ([#71522](https://github.com/kubernetes/kubernetes/pull/71522), [@wangzhen127](https://github.com/wangzhen127))

- Add three metrics to the job controller to monitor if a job works in healthy condition.
  `IndexedJob` has been promoted to Beta. ([#101292](https://github.com/kubernetes/kubernetes/pull/101292), [@AliceZhang2016](https://github.com/AliceZhang2016))