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For initial installations, see the [Setup topics][] in the Kubernetes
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To upgrade to this release from a previous version, take any actions required
[Before Upgrading](#before-upgrading).

For more information about the release and for the latest documentation,
see the [Kubernetes documentation](https://kubernetes.io/docs/home/).

- In the API Priority and Fairness feature, priority levels that are exempt from limitation can now be given a nominal and a lendable concurrency and their dispatching borrows from the concurrency limits of the other priority levels.  For details see https://github.com/kubernetes/enhancements/tree/master/keps/sig-api-machinery/1040-priority-and-fairness#dispatching . ([#118782](https://github.com/kubernetes/kubernetes/pull/118782), [@MikeSpreitzer](https://github.com/MikeSpreitzer)) [SIG API Machinery]...

* fix detach azure disk issue due to dirty cache ([#71495](https://github.com/kubernetes/kubernetes/pull/71495), [@andyzhangx](https://github.com/andyzhangx))
* Fixes ability for admin/edit/view users to see controller revisions, needed for kubectl rollout commands ([#70699](https://github.com/kubernetes/kubernetes/pull/70699), [@liggitt](https://github.com/liggitt))

## Changelog since v1.17.8

## Urgent Upgrade Notes

### (No, really, you MUST read this before you upgrade)

 - CVE-2020-8559 (Medium): Privilege escalation from compromised node to cluster. See https://github.com/kubernetes/kubernetes/issues/92914 for more details.