Multi vCenter support is deprecated as of v1.21. If you have a Kubernetes cluster spanning across multiple vCenter servers, please consider moving all k8s nodes to a single vCenter Server. vSphere CSI Driver does not support Kubernetes deployment spanning across multiple vCenter servers.
  

- `APIServerTracing` feature gate is now enabled by default. Tracing in the API
  Server is still disabled by default, and requires a config file to enable. ([#116144](https://github.com/kubernetes/kubernetes/pull/116144), [@dashpole](https://github.com/dashpole))

  * OOM parser uses kmsg
  * Add hugepages support
  * Add CRI-O support

* Sharing a PID namespace between containers in a pod is disabled by default in version 1.8. To enable for a node, use the `--docker-disable-shared-pid=false` kubelet flag. Be aware that PID namespace sharing requires Docker version greater than or equal to 1.13.1.

* Fix issues related to the eviction manager.

- New staging repo has been created for the `EndpointSlice` reconciler. ([#118953](https://github.com/kubernetes/kubernetes/pull/118953), [@mskrocki](https://github.com/mskrocki))

- Reduce API server memory when many CRDs are loaded by sharing a single etcd3 client logger across all clients ([#111650](https://github.com/kubernetes/kubernetes/pull/111650), [@negz](https://github.com/negz)) [SIG API Machinery]

- Changed node staging path for CSI driver to use a PV agnostic path. Nodes must be drained before updating the kubelet with this change. ([#107065](https://github.com/kubernetes/kubernetes/pull/107065), [@saikat-royc](https://github.com/saikat-royc))

- Reduce API server memory when many CRDs are loaded by sharing a single etcd3 client logger across all clients ([#111649](https://github.com/kubernetes/kubernetes/pull/111649), [@negz](https://github.com/negz)) [SIG API Machinery]

- Fixing issue in Winkernel Proxier - Unexpected active TCP connection drops while horizontally scaling the endpoints for a LoadBalancer Service with External Traffic Policy: Local ([#114039](https://github.com/kubernetes/kubernetes/pull/114039), [@princepereira](https://github.com/princepereira)) [SIG Network]

- Added CEL expressions to `v1alpha1 AuthenticationConfiguration`. ([#121078](https://github.com/kubernetes/kubernetes/pull/121078), [@aramase](https://github.com/aramase))
- Added Windows support for InPlace Pod Vertical Scaling feature. ([#112599](https://github.com/kubernetes/kubernetes/pull/112599), [@fabi200123](https://github.com/fabi200123)) [SIG Autoscaling, Node, Scalability, Scheduling and Windows]

- API Server Tracing now includes a variety of new spans and span events. ([#113172](https://github.com/kubernetes/kubernetes/pull/113172), [@dashpole](https://github.com/dashpole)) [SIG API Machinery, Architecture, Auth, Instrumentation, Network, Node and Scheduling]