*   `etcd2` as a backend is deprecated and support will be removed in Kubernetes 1.13 or 1.14.

### **Auth**

*   Default controller-manager options for `--cluster-signing-cert-file` and `--cluster-signing-key-file` are deprecated and will be removed in a future release. ([#54495](https://github.com/kubernetes/kubernetes/pull/54495),[ @mikedanese](https://github.com/mikedanese))

- The kube-controller-manager managed signers can now have distinct signing certificates and keys.  See the help about `--cluster-signing-[signer-name]-{cert,key}-file`.  `--cluster-signing-{cert,key}-file` is still the default. ([#90822](https://github.com/kubernetes/kubernetes/pull/90822), [@deads2k](https://github.com/deads2k)) [SIG API Machinery, Apps and Auth]

    * configuration scripts to allow configuration of signing duration of
    * certificates issued via the Certificate Signing Request API.

kube-controller-manager has dropped support for the `--insecure-experimental-approve-all-kubelet-csrs-for-group` flag. It is accepted in 1.7, but ignored. Instead, the csrapproving controller uses authorization checks to determine whether to approve certificate signing requests: ([#45619](https://github.com/kubernetes/kubernetes/pull/45619), [@mikedanese](https://github.com/mikedanese))

    * Before upgrading, users must ensure their controller manager will enable the csrapproving controller, create...

- The kube-controller-manager's deprecated `--experimental-cluster-signing-duration` flag is now removed. Adapt your machinery to use the `--cluster-signing-duration` flag that is available since v1.19. ([#108476](https://github.com/kubernetes/kubernetes/pull/108476), [@ialidzhikov](https://github.com/ialidzhikov))

* kube-apiserver: the OpenID Connect authenticator can now verify ID Tokens signed with JOSE algorithms other than RS256 through the --oidc-signing-algs flag. ([#58544](https://github.com/kubernetes/kubernetes/pull/58544), [@ericchiang](https://github.com/ericchiang))

  - [Major Themes](#major-themes)
    - [Dockershim Removed from kubelet](#dockershim-removed-from-kubelet)
    - [Beta APIs Off by Default](#beta-apis-off-by-default)
    - [Signing Release Artifacts](#signing-release-artifacts)
    - [OpenAPI v3](#openapi-v3)
    - [Storage Capacity and Volume Expansion Are Generally Available](#storage-capacity-and-volume-expansion-are-generally-available)

- The `EndpointSlicen Mirroring controller` no longer mirrors the `last-applied-configuration` annotation created by `kubectl` to...

- Added kubelet metrics to track the memory manager allocation and pinning. ([#121778](https://github.com/kubernetes/kubernetes/pull/121778), [@Tal-or](https://github.com/Tal-or))

    * This is not really a bug in FastAPI but in Swagger UI, nevertheless pinning the version will work while a solution is found on the [Swagger UI side](https://github.com/swagger-api/swagger-ui/issues/9337).

### Docs