- Enables YAML support for statusz and flagz. ([#135309](https://github.com/kubernetes/kubernetes/pull/135309), [@richabanker](https://github.com/richabanker)) [SIG API Machinery, Instrumentation and Testing]

- Protobuf serialization of metav1.MicroTime timestamps (used in `Lease` and `Event` API objects) has been corrected to truncate to microsecond precision, to match the documented behavior and JSON/YAML serialization. Any existing persisted data is truncated to microsecond when read from etcd. ([#111936](https://github.com/kubernetes/kubernetes/pull/111936), [@haoruan](https://github.com/haoruan))

    String LDAP_ATTR_HOME_DIRECTORY = "ldap.attr.homeDirectory";

    /** The key of the configuration. e.g. https://repo.maven.apache.org/maven2/org/codelibs/fess/,https://fess.codelibs.org/plugin/artifacts.yaml */
    String PLUGIN_REPOSITORIES = "plugin.repositories";

    /** The key of the configuration. e.g.  */
    String PLUGIN_VERSION_FILTER = "plugin.version.filter";

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	1. In Namespaces that previously had the "DefaultDeny" annotation,
	   you can create equivalent v1 semantics by creating a
	   NetworkPolicy that matches all pods but does not allow any
	   traffic:

	   ```yaml
           kind: NetworkPolicy
           apiVersion: networking.k8s.io/v1
           metadata:
             name: default-deny
           spec:
             podSelector:
	   ```

* Fix aggressive VM calls for Azure VMSS ([#83102](https://github.com/kubernetes/kubernetes/pull/83102), [@feiskyer](https://github.com/feiskyer))

west-1\u0009us-west-2\u0007private\u000bexperiments\u0007ezproxy\u0002df\u0002rj\u0002rr\u0002ui\u0009instances\u0004cust\u0003lpg\u0003rma\u0003svc\u0009appengine\u0004es-1\u0005aruba\u0003it1\u0004runs\u0009baremetal\u0006fr-par\u0003k8s\u0006nl-ams\u0006pl-waw\u0009scalebook\rsmartlabeling\u0008clusters\u0008srvrless\u0008realtime\u0007airflow\u0009compute-1\u0003elb\u0003rds\u0002s3\u0004s3-1\u000cs3-ap-east-1\u0011s3-ap-northeast-1\u0011s3-ap-northeast-2\u0011s3-ap-northeast-3\rs3-ap-south-...

- Updated the generic apiserver library to produce an error if a new API server is configured with support for a data format other than JSON, YAML, or Protobuf. ([#121325](https://github.com/kubernetes/kubernetes/pull/121325), [@benluddy](https://github.com/benluddy)) [SIG API Machinery]

  upgrading a cluster, all objects in resource.k8s.io/v1alpha1 (ResourceClaim, ResourceClaimTemplate,
  ResourceClass, PodScheduling) must be deleted. The changes are internal, so
  YAML files which create pods and resource claims don't need changes except for
  the newer `apiVersion`. ([#116299](https://github.com/kubernetes/kubernetes/pull/116299), [@pohly](https://github.com/pohly))