- The `RemoteRequestHeaderUID` feature moves to beta and is now enabled by default. This makes the kube-apiserver propagate UIDs in the `X-Remote-Uid` header in requests to the aggregated API servers. The header is not honored by default for incoming requests, but that can be enabled by setting the `--requestheader-uid-headers` flag explicitly. ([#130560](https://git...

- Changed underlying logic to propagate pod-level hugepage cgroup to containers when they did not specify hugepage resources.

- Removed scheduler names from preemption event messages. ([#114980](https://github.com/kubernetes/kubernetes/pull/114980), [@mimowo](https://github.com/mimowo))

* [Federation] Remove FEDERATIONS_DOMAIN_MAP references ([#43137](https://github.com/kubernetes/kubernetes/pull/43137), [@shashidharatd](https://github.com/shashidharatd))
* Fix for [federation failing to propagate cascading deletion](https://github.com/kubernetes/kubernetes/issues/44304). ([#44108](https://github.com/kubernetes/kubernetes/pull/44108), [@csbell](https://github.com/csbell))

  * The `VolumeMount.Propagation` field for `VolumeMount` in pod containers is now available.

  * You can now set `VolumeMount.Propagation` to `Bidirectional` to enable a particular mount for a container to propagate itself to the host or other containers.

* [alpha] Improve Flex volume deployment

  * Flex volume driver deployment is simplified in the following ways:

* Fix for [federation failing to propagate cascading deletion](https://github.com/kubernetes/kubernetes/issues/44304). ([#44108](https://github.com/kubernetes/kubernetes/pull/44108), [@csbell](https://github.com/csbell))

- Kubeadm now propagates proxy environment variables to kube-proxy ([#84559](https://github.com/kubernetes/kubernetes/pull/84559), [@yastij](https://github.com/yastij))

* Fix issue of colliding nodePorts when the cluster has services with externalTrafficPolicy=Local ([#64468](https://github.com/kubernetes/kubernetes/pull/64468), [@nicksardo](https://github.com/nicksardo))
* Fix incorrectly propagated ResourceVersion in ListRequests returning 0 items. ([#64150](https://github.com/kubernetes/kubernetes/pull/64150), [@wojtek-t](https://github.com/wojtek-t))

* fixes a panic applying json patches containing out of bounds operations ([#64355](https://github.com/kubernetes/kubernetes/pull/64355), [@liggitt](https://github.com/liggitt))
* Fix incorrectly propagated ResourceVersion in ListRequests returning 0 items. ([#64150](https://github.com/kubernetes/kubernetes/pull/64150), [@wojtek-t](https://github.com/wojtek-t))

- APIServerTracing now collects spans from etcd client calls, and propagates context to etcd. ([#103216](https://github.com/kubernetes/kubernetes/pull/103216), [@dashpole](https://github.com/dashpole)) [SIG API Machinery, Cloud Provider and Instrumentation]