- Projects which use k8s.io/code-generator and invoke `generate-groups` or `generate-internal-groups.sh` have a new, simpler script (`kube_codegen.sh`) they can use.  The old scripts are deprecated but remain intact. ([#117262](https://github.com/kubernetes/kubernetes/pull/117262), [@thockin](https://github.com/thockin))...

`system:masters` built-in super-powers / break-glass Group that can bypass RBAC. Before this change, the default `admin.conf` was bound to `system:masters` Group, which was undesired. Executing `kubeadm init phase kubeconfig all` or just `kubeadm init` will now generate the new `super-admin.conf` file. The cluster admin can then decide to keep the file present on a node host or move it to a safe location. `kubadm certs renew` will renew the certificate in `super-admin.conf` to one year if the file exists; if it...

*   Code generation for CRD and User API server types is improved with the addition of two new scripts to k8s.io/code-generator: `generate-groups.sh` and `generate-internal-groups.sh`. ([#52186](https://github.com/kubernetes/kubernetes/pull/52186),[ @sttts](https://github.com/sttts))

- The validation-gen code generator generated validation code that supported validation ratcheting. ([#132236](https://github.com/kubernetes/kubernetes/pull/132236), [@yongruilin](https://github.com/yongruilin)) [SIG API Machinery, Apps, Auth and Node]

- Omit enum declarations from the static openapi file captured at https://git.k8s.io/kubernetes/api/openapi-spec. This file is used to generate API clients, and use of enums in those generated clients (rather than strings) can break forward compatibility with additional future values in those fields. See https://issue.k8s.io/109177 for details. ([#109178](https://github.com/kubernetes/kubernetes/pull/109178), [...

- Official binaries now include the golang generated build ID `buildid` instead of an empty string. ([#101411](https://github.com/kubernetes/kubernetes/pull/101411), [@saschagrunert](https://github.com/saschagrunert))
- Remove balanced attached node volumes feature. ([#102443](https://github.com/kubernetes/kubernetes/pull/102443), [@ravisantoshgudimetla](https://github.com/ravisantoshgudimetla))

- Add support to generate client-side binaries for windows/arm64 platform ([#104894](https://github.com/kubernetes/kubernetes/pull/104894), [@pacoxu](https://github.com/pacoxu))

* kubeadm 1.8 now properly handles upgrades from to 1.7.x to newer release in 1.7 branch ([#53338](https://github.com/kubernetes/kubernetes/pull/53338), [@kad](https://github.com/kad))
* Add generate-groups.sh and generate-internal-groups.sh to k8s.io/code-generator to easily run generators against CRD or User API Server types. ([#52186](https://github.com/kubernetes/kubernetes/pull/52186), [@sttts](https://github.com/sttts))

- Remove deprecated `--generator, --replicas, --service-generator, --service-overrides, --schedule` from `kubectl run`

    - [PID Limits graduates to General Availability](#pid-limits-graduates-to-general-availability)
    - [API Priority and Fairness graduates to Beta](#api-priority-and-fairness-graduates-to-beta)
    - [IPv4/IPv6 run](#ipv4ipv6-run)
    - [go1.15.5](#go1155)
    - [CSI Volume Snapshot graduates to General Availability](#csi-volume-snapshot-graduates-to-general-availability)