`UnversionedKubeletConfigMap` feature gate to Beta and enabled the feature by default. This implies that 1) for new clusters kubeadm will start using the `kube-system/kubelet-config` naming scheme for the kubelet ConfigMap and RBAC rules, instead of the legacy `kubelet-config-x.yy` naming. 2) during upgrade, kubeadm will only write the new scheme ConfigMap and RBAC objects. To disable the feature you can pass `UnversionedKubeletConfigMap: false` in the kubeadm config for new clusters. For upgrade on existing clusters...

  // "Host" in httpHeaders instead.
  // +optional
  optional string host = 3;

  // Scheme to use for connecting to the host.
  // Defaults to HTTP.
  // +optional
  optional string scheme = 4;

  // Custom headers to set in the request. HTTP allows repeated headers.
  // +optional
  repeated HTTPHeader httpHeaders = 5;
}

  <mime-type type="text/x-scala">
    <_comment>Scala source code</_comment>
    <glob pattern="*.scala"/>
    <sub-class-of type="text/plain"/>
  </mime-type>

  <mime-type type="text/x-scheme">
    <_comment>Scheme source code</_comment>
    <glob pattern="*.scm"/>
    <sub-class-of type="text/plain"/>
  </mime-type>

  <mime-type type="text/x-sed">
    <_comment>Sed code</_comment>

### API-Machinery

* Fixed webhooks to use the scheme provided in clientConfig, instead of defaulting to http. ([#60943](https://github.com/kubernetes/kubernetes/pull/60943), [@jennybuckley](https://github.com/jennybuckley))

- 'Container `preStop` and `postStart` lifecycle handlers using `httpGet` now
  honor the specified `scheme` and `headers` fields. This enables setting custom
  headers and changing the scheme to `HTTPS`, consistent with container
  startup/readiness/liveness probe capabilities. Lifecycle handlers configured
  with `scheme: HTTPS` that encounter errors indicating the endpoint is actually

* ✨ Add `description` parameter to all the security scheme classes, e.g. `APIKeyQuery(name="key", description="A very cool API key")`. PR [#1757](https://github.com/tiangolo/fastapi/pull/1757) by [@hylkepostma](https://github.com/hylkepostma).