* Metadata of CustomResources is now pruned and schema-checked during deserialization of requests and when read from etcd. In the former case, invalid meta data is rejected, in the later it is dropped from the CustomResource objects. ([#64267](https://github.com/kubernetes/kubernetes/pull/64267), [@sttts](https://github.com/sttts))

- kubeadm now automatically sets the `--pod-infra-container-image` flag when starting the kubelet.

### SIG IBM Cloud

Users who create ephemeral containers using `kubectl debug` should note that kubectl version 1.22 will attempt to fall back to the old API; older versions of kubectl will not work with cluster versions of 1.22 or later. Please update kubectl to 1.22 if you wish to use `kubectl debug` with a mix of cluster versions.

## Known Issues

### CPU and Memory manager are not working correctly for Guaranteed Pods with multiple containers

- Add possibility to configure controller manager to use IPv6 dual stack:
  use `--cluster-cidr="<cidr1>,<cidr2>"`.
  Notes:
  1. Only the first two CIDRs are used (soft limits for Alpha, might be lifted later on).
  2. Only the "RangeAllocator" (default) is allowed as a value for `--cidr-allocator-type`. Cloud allocators are not compatible with IPv6 dual stack

- Sometimes, the scheduler incorrectly placed a pod in the "unschedulable" queue instead of the "backoff" queue. This happened when some plugin previously declared the pod as "unschedulable" and then in a later attempt encounters some other error. Scheduling of that pod then got delayed by up to five minutes, after which periodic flushing moved the pod back into the "active" queue. ([#120334](https://github.com/kubernetes/kubernetes/pull/120334), [@pohly...

### Network

* Fixed kube-proxy to work correctly with iptables 1.6.2 and later. ([#60978](https://github.com/kubernetes/kubernetes/pull/60978), [@danwinship](https://github.com/danwinship))

* 👥 Update FastAPI People. PR [#9999](https://github.com/tiangolo/fastapi/pull/9999) by [@tiangolo](https://github.com/tiangolo).
* 🐳 Update Dockerfile with compatibility versions, to upgrade later. PR [#9998](https://github.com/tiangolo/fastapi/pull/9998) by [@tiangolo](https://github.com/tiangolo).

### Bug or Regression

- Fixes a race condition in the iptables mode of kube-proxy in 1.27 and later
  that could result in some updates getting lost (e.g., when a service gets a
  new endpoint, the rules for the new endpoint might not be added until
  much later). ([#122815](https://github.com/kubernetes/kubernetes/pull/122815), [@wedaly](https://github.com/wedaly)) [SIG Network]

- Support for go modules in Kubernetes Core.
- Continued preparation for cloud provider extraction and code organization.  The cloud provider code has been moved to kubernetes/legacy-cloud-providers for easier removal later and external consumption.
- Kubectl [get and describe](https://github.com/kubernetes/enhancements/issues/515) now works with extensions

* openstack cinder detach problem is fixed if nova is shutdowned ([#56846](https://github.com/kubernetes/kubernetes/pull/56846), [@zetaab](https://github.com/zetaab))
* Fixed kube-proxy to work correctly with iptables 1.6.2 and later. ([#61734](https://github.com/kubernetes/kubernetes/pull/61734), [@danwinship](https://github.com/danwinship))