* The 'scheduling_latency_seconds' metric into has been split into finer steps (predicate, priority, preemption). ([#65306](https://github.com/kubernetes/kubernetes/pull/65306), [@shyamjvs](https://github.com/shyamjvs))

- Revised the kubelet API Authorization with new subresources, that allow finer-grained authorization checks and access control for kubelet endpoints.
  Provided you enable the `KubeletFineGrainedAuthz` feature gate, you can access kubelet's `/healthz` endpoint by granting the caller `nodes/helathz` permission in RBAC.

* Corrected a mistake in the documentation for wait.PollImmediate(...) ([#65026](https://github.com/kubernetes/kubernetes/pull/65026), [@spew](https://github.com/spew))
* Split 'scheduling_latency_seconds' metric into finer steps (predicate, priority, premption) ([#65306](https://github.com/kubernetes/kubernetes/pull/65306), [@shyamjvs](https://github.com/shyamjvs))

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- Supported fine-grained supplemental groups policy (KEP-3619), which enabled
  fine-grained control for supplementary groups in the first container processes.
  This allows you to choose whether to include groups defined in the container image (/etc/groups)

- Expanded `kubectl wait` to work with more types of selectors. ([#71746](https://github.com/kubernetes/kubernetes/pull/71746), [@rctl](https://github.com/rctl))
- Added configuration for AWS endpoint fine control: ([#72245](https://github.com/kubernetes/kubernetes/pull/72245), [@ampsingram](https://github.com/ampsingram))

- KEP-3619: fined-grained supplemental groups policy is graduated to Beta. Note that kubelet now rejects pods with `.spec.securityContext.supplementalGroupsPolicy: Strict` when scheduled to the node that does not support the feature (`.status.features.supplementalGroupsPolicy:...

- Added a new feature gate, `SchedulerQueueingHints` (enabled by default).
  The new feature gate activates a framework for fine-grained filtering of events related to scheduler plugins.

   * **NOTE:** Self-hosting will be the default way to host the control plane in the next release, v1.9

* [alpha] A new `phase` subcommand supports performing only subtasks of the full `kubeadm init` flow. Combined with fine-grained configuration, kubeadm is now more easily consumable by higher-level provisioning tools like kops or GKE. ([#356](https://github.com/kubernetes/enhancements/issues/356), [@luxas](https://github.com/luxas))

- API priority and fairness metrics use snake_case in label names ([#96236](https://github.com/kubernetes/kubernetes/pull/96236), [@adtac](https://github.com/adtac)) [SIG API Machinery, Cluster Lifecycle, Instrumentation and Testing]