- Implemented full support for contextual logging in  `client-go/rest`. `BackoffManagerWithContext` was used instead of  `BackoffManager` to ensure that the caller could interrupt the sleep. ([#127709](https://github.com/kubernetes/kubernetes/pull/127709), [@pohly](https://github.com/pohly)) [SIG API Machinery, Architecture, Auth, Cloud Provider, Instrumentation, Network and Node]

  is removed in `v1.29`. Migrated `kube-scheduler` configuration files to `kubescheduler.config.k8s.io/v1`.' ([#119994](https://github.com/kubernetes/kubernetes/pull/119994), [@SataQiu](https://github.com/SataQiu))
- A new sleep action for the `PreStop` lifecycle hook was added, allowing containers to pause for a specified duration before termination. ([#119026](https://github.com/kubernetes/kubernetes/pull/119026), [@AxeZhan](https://github.com/AxeZhan))

- Allows PreStop lifecycle handler's sleep action to have a zero value ([#127094](https://github.com/kubernetes/kubernetes/pull/127094), [@sreeram-venkitesh](https://github.com/sreeram-venkitesh)) [SIG Apps, Node and Testing]

- A new metric `lifecycle_handler_sleep_terminated_total` is added to record how many times LifecycleHandler sleep got unexpectedly terminated. ([#122456](https://github.com/kubernetes/kubernetes/pull/122456), [@AxeZhan](https://github.com/AxeZhan))

- Fixes a bug that when there is a "connection refused" error, the reflector's ListAndWatch func will return directly but what expected is that sleep 1 second and rewatch since the specified resourceVersion.
  ([#81634](https://github.com/kubernetes/kubernetes/pull/81634), [@likakuli](https://github.com/likakuli))

cluster-wide seccomp defaults, the kubelet uses the `RuntimeDefault` seccomp profile by default, rather than than `Unconfined`. This allows enhancing the default cluster wide workload security of the Kubernetes deployment. Security administrators will now sleep better knowing there is some security by default for the workloads.

To learn more about the feature, please refer to the official [seccomp tutorial](https://kubernetes.io/docs/tutorials/clusters/seccomp/#enable-the-use-of-runtimedefau...