as in <code>'x'</code> or <code>'\n'</code>.
Within the quotes, any character may appear except newline and unescaped single
quote. A single quoted character represents the Unicode value
of the character itself,
while multi-character sequences beginning with a backslash encode
values in various formats.
</p>

<p>
The simplest form represents the single character within the quotes;

* Azure VMSS: support VM names to contain the `_` character ([#63526](https://github.com/kubernetes/kubernetes/pull/63526), [@djsly](https://github.com/djsly))

### Auth

- Fixed OpenID Connect (OIDC) token refresh when the client secret contains a special character. ([#76914](https://github.com/kubernetes/kubernetes/pull/76914), [@tsuna](https://github.com/tsuna))

* Block device support has been added for azure disk. ([#63841](https://github.com/kubernetes/kubernetes/pull/63841), [@andyzhangx](https://github.com/andyzhangx))
* Azure VM names can now contain the underscore (`_`) character ([#63526](https://github.com/kubernetes/kubernetes/pull/63526), [@djsly](https://github.com/djsly))
* Azure disks now support external resource groups.

* Support new NODE_OS_DISTRIBUTION 'custom' on GCE ([#61235](https://github.com/kubernetes/kubernetes/pull/61235), [@yguo0905](https://github.com/yguo0905))
* Fixes a bug where character devices are not recognized by the kubelet ([#60440](https://github.com/kubernetes/kubernetes/pull/60440), [@andrewsykim](https://github.com/andrewsykim))

- The etcd client library vendored in v1.16 (github.com/coreos/etcd/clientv3) has a bug where IPv6 IP addresses get incorrectly trimmed to the first occurance of the `:` character. This affects all users of the client library including the kube-apiserver and kubeadm. We are targeting the fix for this bug in v1.16.3. ([#83550](https://github.com/kubernetes/kubernetes/issues/83550))

## Urgent Upgrade Notes