- [Generic Ephemeral Volumes](#generic-ephemeral-volumes)
    - [CSI Service Account Token](#csi-service-account-token)
    - [CSI Health Monitoring](#csi-health-monitoring)
  - [Known Issues](#known-issues)
    - [<code>TopologyAwareHints</code> feature falls back to default behavior](#topologyawarehints-feature-falls-back-to-default-behavior)
  - [Urgent Upgrade Notes](#urgent-upgrade-notes)

* sysctl support is now considered beta ([ref](https://github.com/kubernetes/enhancements/issues/34))
* Support for Azure Virtual Machine Scale Sets is now considered beta. ([ref](https://github.com/kubernetes/enhancements/issues/513))
* Azure support for Cluster Autoscaler is now considered beta. ([ref](https://github.com/kubernetes/enhancements/issues/514))

* Kubernetes json deserializer is now case-sensitive to restore compatibility with pre-1.8 servers. ([#65157](https://github.com/kubernetes/kubernetes/pull/65157), [@caesarxuchao](https://github.com/caesarxuchao))
    * If your config files contains fields with wrong case, the config files will be now invalid.

- Warnings for the use of deprecated and known-bad values in pod specs are now sent. ([#101688](https://github.com/kubernetes/kubernetes/pull/101688), [@liggitt](https://github.com/liggitt))

* In addition to restricting GCE metadata requests to known APIs, the metadata-proxy now restricts query strings to known parameters. ([#71094](https://github.com/kubernetes/kubernetes/pull/71094), [@dekkagaijin](https://github.com/dekkagaijin))

## Known Issues

This section contains a list of known issues reported in Kubernetes 1.9 release. The content is populated from the [v1.9.x known issues and FAQ accumulator] [#57159](https://github.com/kubernetes/kubernetes/issues/57159).

## Known Issues

No Known Issues Reported

## Urgent Upgrade Notes

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

#### kube-apiserver:

</li>
<li>
	At most one of the type parameters has a known type argument.
	In this case, the type parameters are <i>joined</i>:
	they both stand for the same type argument.
	If neither type parameter has a known type argument yet,
	a future type argument inferred for one the type parameters
	is simultaneously inferred for both of them.
</li>
<li>
	Both type parameters have a known type argument

  - kubeadm now handles air-gapped environments by using the local client version as a fallback.
  - Some kubeadm commands are now allowed to work in a completely offline mode.
- Certificate handling improvements:
  - Renew certs as part of upgrade.
  - New `kubeadm alpha phase certs renew` command for renewing certificates.
  - Certificates created with kubeadm now have improved uniqueness of Distinguished Name fields.

- [v1.6.5](#v165)
  - [Known Issues for v1.6.5](#known-issues-for-v165)
  - [Downloads for v1.6.5](#downloads-for-v165)
    - [Client Binaries](#client-binaries-8)
    - [Server Binaries](#server-binaries-8)
    - [Node Binaries](#node-binaries-8)
  - [Changelog since v1.6.4](#changelog-since-v164)
    - [Other notable changes](#other-notable-changes-8)
- [v1.6.4](#v164)
  - [Known Issues for v1.6.4](#known-issues-for-v164)