* **WARNING:** A [known issue](https://github.com/kubernetes/kubernetes/issues/43815)
    in v1.6.0 causes `kubeadm init` to hang. Please use v1.6.1, which fixes the issue.
  * All communication is now over TLS
  * Authorization plugins can be installed by kubeadm, including the new default of RBAC
  * The bootstrap token system now allows token management and expiration

- RemoteCommand feature gates for kubectl exec, cp, and attach over WebSockets are now enabled by default (Beta):
  - Server-side feature gate: `TranslateStreamCloseWebsocketRequests`
  - Client-side (kubectl) feature gate: `KUBECTL_REMOTE_COMMAND_WEBSOCKETS`

- Fixed admission metrics histogram bucket sizes to cover 25ms to ~2.5 seconds. ([#78608](https://github.com/kubernetes/kubernetes/pull/78608), [@jpbetz](https://github.com/jpbetz))

* Adds TCPCloseWaitTimeout option to kube-proxy for sysctl nf_conntrack_tcp_timeout_time_wait ([#35919](https://github.com/kubernetes/kubernetes/pull/35919), [@bowei](https://github.com/bowei))
* Fix how we iterate over active jobs when removing them for Replace policy ([#36161](https://github.com/kubernetes/kubernetes/pull/36161), [@soltysh](https://github.com/soltysh))

    - `apiserver_flowcontrol_demand_seats_high_watermark`: High watermark, over last adjustment period, of demand_seats
    - `apiserver_flowcontrol_demand_seats_average`: Time-weighted average, over last adjustment period, of demand_seats
    - `apiserver_flowcontrol_demand_seats_stdev`: Time-weighted standard deviation, over last adjustment period, of demand_seats

  KEPs or supporting documentation, please reference a specific commit and avoid
  linking directly to the master branch. This ensures that links reference a
  specific point in time, rather than a document that may change over time.
  
  See here for guidance on getting permanent links to files: https://help.github.com/en/articles/getting-permanent-links-to-files
  
  Please use the following format for linking documentation:
  - [KEP]: <link>

### **Cluster Federation**
#### Placement Policy
* [alpha] The federation-apiserver now supports a SchedulingPolicy admission controller that enables policy-based control over placement of federated resources. For more information, see [Set up placement policies in Federation](https://kubernetes.io/docs/tasks/federation/set-up-placement-policies-federation/).

#### Cluster Selection

- Fix kube-apiserver not to create default/kubernetes service endpoints before it reports readiness via the /healthz and therefore is ready to serve requests. Also early during startup old endpoints are remove which might be left over from a previously crashed kube-apiserver. ([#74668](https://github.com/kubernetes/kubernetes/pull/74668), [@sttts](https://github.com/sttts))

* 'kubectl describe pv' now shows events ([#27431](https://github.com/kubernetes/kubernetes/pull/27431), [@jsafrane](https://github.com/jsafrane))
* AWS kube-up: set net.ipv4.neigh.default.gc_thresh1=0 to avoid ARP over-caching ([#27682](https://github.com/kubernetes/kubernetes/pull/27682), [@justinsb](https://github.com/justinsb))