### Action Required

* action required: the API server and client-go libraries have been fixed to support additional non-alpha-numeric characters in UserInfo "extra" data keys. Both should be updated in order to properly support extra data containing "/" characters or other characters disallowed in HTTP headers. ([#65799](https://github.com/kubernetes/kubernetes/pull/65799), [@dekkagaijin](https://github.com/dekkagaijin))

* Modified influxdb petset to provision persistent  volume. ([#28840](https://github.com/kubernetes/kubernetes/pull/28840), [@jszczepkowski](https://github.com/jszczepkowski))
* Allow service names up to 63 characters (RFC 1035) ([#29523](https://github.com/kubernetes/kubernetes/pull/29523), [@fraenkel](https://github.com/fraenkel))

- kubeadm: fixed a bug in the underlying library for diff related to characters like '%' ([#73941](https://github.com/kubernetes/kubernetes/pull/73941), [@neolit123](https://github.com/neolit123))

    executeSynchronously(Request(server.url("/")))
    assertThat(server.takeRequest().exchangeIndex).isEqualTo(0)
    assertThat(server.takeRequest().exchangeIndex).isEqualTo(1)
  }

  /** We forbid non-ASCII characters in outgoing request headers, but accept UTF-8.  */
  @Test
  fun responseHeaderParsingIsLenient() {
    val headersBuilder = Headers.Builder()
    headersBuilder.add("Content-Length", "0")

- Added support for CEL expressions with escaped names in the structured authentication config. Using `[...]` to access claims or user data was recommended when names contained characters that would otherwise need escaping. CEL optionals with `?` could be used where has was not applicable — for example, `claims[?"kubernetes.io"]` or `user.extra[?"domain.io/foo"]`. ([#131574](https://github.com/kubernetes/kubernetes/pull/131574),...

### Failing Test

- Escape the special characters like `[`, `]` and ` ` that exist in vsphere windows path ([#98830](https://github.com/kubernetes/kubernetes/pull/98830), [@liyanhui1228](https://github.com/liyanhui1228)) [SIG Storage and Windows]

- Added a alpha feature, behind the `RelaxedEnvironmentVariableValidation` feature gate.
  When that gate is enabled, Kubernetes allows almost all printable ASCII characters to be used in the names
  of environment variables for containers in Pods. ([#123385](https://github.com/kubernetes/kubernetes/pull/123385), [@HirazawaUi](https://github.com/HirazawaUi))

- In the `kubectl describe` output, the fields with names containing special characters are now displayed as-is without any pretty formatting, avoiding awkward outputs.  ([#75483](https://github.com/kubernetes/kubernetes/pull/75483), [@gsadhani](https://github.com/gsadhani))

- Fixed CSI `PersistentVolumes` to allow Secrets names longer than 63 characters. ([#114776](https://github.com/kubernetes/kubernetes/pull/114776), [@jsafrane](https://github.com/jsafrane))

## Changelog since v1.19.8

## Changes by Kind

### Failing Test

- Fix handing special characters in the volume path on Windows ([#99137](https://github.com/kubernetes/kubernetes/pull/99137), [@yujuhong](https://github.com/yujuhong)) [SIG Storage]

### Bug or Regression