*   The API group/version for the kube-proxy configuration has changed from `componentconfig/v1alpha1` to `kubeproxy.config.k8s.io/v1alpha1`. If you are using a config file for kube-proxy instead of the command line flags, you must change its apiVersion to `kubeproxy.config.k8s.io/v1alpha1`. ([#53645](https://github.com/kubernetes/kubernetes/pull/53645), [@xiangpengzhao](https://github.com/xiangpengzhao))

    * You can read more about it in the docs for [Declare Request Example Data](https://fastapi.tiangolo.com/tutorial/schema-extra-example/).
* The attribute `schema_extra` for the internal class `Config` has been replaced by the key `json_schema_extra` in the new `model_config` dict.

- Introduce api-extensions category which will return: mutating admission configs, validating admission configs, CRDs and APIServices when used in kubectl get, for example. ([#95603](https://github.com/kubernetes/kubernetes/pull/95603), [@soltysh](https://github.com/soltysh)) [SIG API Machinery]

_hash_status_last_timestamp_seconds`, `apiserver_encryption_config_controller_automatic_reload_failures_total`, `apiserver_encryption_config_controller_automatic_reload_success_total`, `apiserver_encryption_config_controller_automatic_reload_last_timestamp_seconds`.
  
  Fixed bug to surface events for the following metrics: `apiserver_encryption_config_controller_automatic_reload_failures_total`, `apiserver_encryption_config_controller_automatic_reload_last_timestamp_seconds`, `apiser...

* kube-apiserver: The `AdmissionConfiguration` type accepted by `--admission-control-config-file` has been promoted to `apiserver.config.k8s.io/v1` with no schema changes. ([#85098](https...

- kubeadm: Default component configs are now printable via kubeadm config print-default ([#66074](https://github.com/kubernetes/kubernetes/pull/66074), [@rosti](https://github.com/rosti)) Courtesy of SIG Cluster Lifecycle

    /** The key of the configuration. e.g. 100 */
    String PAGE_DATA_CONFIG_MAX_FETCH_SIZE = "page.data.config.max.fetch.size";

    /** The key of the configuration. e.g. 100 */
    String PAGE_WEB_CONFIG_MAX_FETCH_SIZE = "page.web.config.max.fetch.size";

    /** The key of the configuration. e.g. 100 */
    String PAGE_FILE_CONFIG_MAX_FETCH_SIZE = "page.file.config.max.fetch.size";

    /** The key of the configuration. e.g. 1000 */

kubeadm-config Before:

```
apiVersion: v1
kind: ConfigMap
metadata:
  name: kubeadm-config
data:
  MasterConfiguration: |
    kubeProxy:
      config:
        featureGates: "SupportIPVSProxyMode=true"
```

* kubeadm: remove deprecated kubeadm config print-defaults command ([#71467](https://github.com/kuberne...

   * -viper-config can be used to set also the options defined by command line flags
   * the default config file is "e2e.yaml/toml/json/..." and the test starts when no such config is found (as before) but if -viper-config is used, the config file must exist
   * -viper-config can be used to select a file with full path, with or without file suffix