* Experimental support to reserve a pod's memory request from being utilized by
  pods in lower QoS tiers.
  ([#41149](https://github.com/kubernetes/kubernetes/pull/41149),
  [@sjenning](https://github.com/sjenning))
* Port forwarding can forward over websockets or SPDY.

* Fix init container status reporting when active deadline is exceeded. ([#46305](https://github.com/kubernetes/kubernetes/pull/46305), [@sjenning](https://github.com/sjenning))

* Moved qos to api.helpers. ([#44906](https://github.com/kubernetes/kubernetes/pull/44906), [@k82cn](https://github.com/k82cn))

#### kubelet

* [alpha] Kubelet now supports alternative container-level CPU affinity policies by using the new CPU manager. ([#375](https://github.com/kubernetes/enhancements/issues/375), [@sjenning](https://github.com/sjenning), [@ConnorDoyle](https://github.com/ConnorDoyle))

- kubelet now exports an `kubelet_evictions` metric that counts the number of pod evictions carried out by the kubelet to reclaim resources ([#81377](https://github.com/kubernetes/kubernetes/pull/81377), [@sjenning](https://github.com/sjenning))

### Removed metrics

- Set a low `oom_score_adj` for containers in pods with system-critical priorities ([#73758](https://github.com/kubernetes/kubernetes/pull/73758), [@sjenning](https://github.com/sjenning))
- kubelet: Resolved hang/timeout issues when running large numbers of pods with unique `ConfigMap/Secret` references ([#74755](https://github.com/kubernetes/kubernetes/pull/74755), [@liggitt](https://github.com/liggitt))

## Other Notable Changes

### SIG API Machinery

- Updated creation of `LoadBalancer` services, for there to be fewer AWS security group rules in most cases. ([#112267](https://github.com/kubernetes/kubernetes/pull/112267), [@sjenning](https://github.com/sjenning))
- Updated the system-validators library to v1.8.0 ([#112026](https://github.com/kubernetes/kubernetes/pull/112026), [@pacoxu](https://github.com/pacoxu))

* Metrics were added to network plugin to report latency of CNI operations ([#53446](https://github.com/kubernetes/kubernetes/pull/53446), [@sjenning](https://github.com/sjenning))
* GCE: Fix issue deleting internal load balancers when the firewall resource may not exist. ([#53450](https://github.com/kubernetes/kubernetes/pull/53450), [@nicksardo](https://github.com/nicksardo))