* AWS: recognize us-east-2 region ([#35013](https://github.com/kubernetes/kubernetes/pull/35013), [@justinsb](https://github.com/justinsb))
* Replace controller presence checking logic ([#36924](https://github.com/kubernetes/kubernetes/pull/36924), [@krousey](https://github.com/krousey))

- The metadata.clusterName field is deprecated. This field has always been unwritable and always blank, but its presence is confusing, so we will remove it next release. Out of an abundance of caution, this release we have merely changed the name in the go struct to ensure any accidental client uses are found before complete removal. ([#108717](https://github.com/...

- Fixed a bug that prevents kubectl to validate CRDs with schema using x-kubernetes-preserve-unknown-fields on object fields. ([#96369](https://github.com/kubernetes/kubernetes/pull/96369), [@gautierdelorme](https://github.com/gautierdelorme)) [SIG API Machinery and Testing]

    return new Present<>(
        checkNotNull(
            function.apply(reference),
            "the Function passed to Optional.transform() must not return null."));
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    if (obj instanceof Present) {
      Present<?> other = (Present<?>) obj;
      return reference.equals(other.reference);
    }

    return new Present<>(
        checkNotNull(
            function.apply(reference),
            "the Function passed to Optional.transform() must not return null."));
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    if (obj instanceof Present) {
      Present<?> other = (Present<?>) obj;
      return reference.equals(other.reference);
    }

For more information, see [#51899](https://github.com/kubernetes/kubernetes/issues/51899).

* Minikube version 0.22.2 or lower does not work with kubectl version 1.8 or higher. This issue is caused by the presence of an unregistered type in the minikube API server. New versions of kubectl force validate the OpenAPI schema, which is not registered with all known types in the minikube API server.

* Fixed a bug which caused the apiserver reboot failure in the presence of malfunctioning webhooks. ([#59073](https://github.com/kubernetes/kubernetes/pull/59073), [@caesarxuchao](https://github.com/caesarxuchao))

* Configurable etcd compaction frequency in GCE ([#59106](https://github.com/kubernetes/kubernetes/pull/59106), [@wojtek-t](https://github.com/wojtek-t))

* Fixed a bug which caused the apiserver reboot failure in the presence of malfunctioning webhooks. ([#59073](https://github.com/kubernetes/kubernetes/pull/59073), [@caesarxuchao](https://github.com/caesarxuchao))

- Failure to start a container cannot accidentally result in the pod being considered "Succeeded" in the presence of deletion. ([#108882](https://github.com/kubernetes/kubernetes/pull/108882), [@rphillips](https://github.com/rphillips)) [SIG Node]

- Failure to start a container cannot accidentally result in the pod being considered "Succeeded" in the presence of deletion. ([#108883](https://github.com/kubernetes/kubernetes/pull/108883), [@rphillips](https://github.com/rphillips)) [SIG Node]