proxy_read_timeout flag to kubeapi_load_balancer charm. ([#57926](https://github.com/kubernetes/kubernetes/pull/57926), [@wwwtyro](https://github.com/wwwtyro))

* Check for known manifests during preflight instead of only checking for non-empty manifests directory. This makes the preflight checks less heavy-handed by specifically checking for well-known files (kube-apiserver.yaml, kube-controller-manager.yaml, kube-scheduler.yaml, etcd.yaml) in /etc/kubernetes/manifests instead of simply checking...

- The flag `--skip-preflight-checks` of kubeadm has been removed. Please use `--ignore-preflight-errors` instead. ([#62727](https://github.com/kubernetes/kubernetes/pull/62727), [@xiangpengzhao](https://github.com/xiangpengzhao))

### Other (Cleanup or Flake)

- Kubeadm: removed `socat` and `ebtables` from kubeadm preflight checks ([#127415](https://github.com/kubernetes/kubernetes/pull/127415), [@saschagrunert](https://github.com/saschagrunert)) [SIG Cluster Lifecycle]

## Dependencies

### Added
_Nothing has changed._

* kubeadm now produces error during preflight checks if swap is enabled. Users, who can setup kubelet to run in unsupported environment with enabled swap, will be able to skip that preflight check. ([#55399](https://github.com/kubernetes/kubernetes/pull/55399), [@kad](https://github.com/kad))

- Deprecate --generator flag from kubectl create commands ([#88655](https://github.com/kubernetes/kubernetes/pull/88655), [@soltysh](https://github.com/soltysh)) [SIG CLI]
- During initialization phase (preflight), kubeadm now verifies the presence of the conntrack executable ([#85857](https://github.com/kubernetes/kubernetes/pull/85857), [@hnanni](https://github.com/hnanni)) [SIG Cluster Lifecycle]

- Kubeadm: allow RSA and ECDSA format keys in preflight check ([#112535](https://github.com/kubernetes/kubernetes/pull/112535), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

## Dependencies

### Added
_Nothing has changed._

### Changed

- Added regions ap-northeast-3 and eu-west-3 to the list of well known AWS regions. ([#70252](https://github.com/kubernetes/kubernetes/pull/70252), [@nckturner](https://github.com/nckturner))
- kubeadm: Implemented preflight check to ensure that number of CPUs ([#70048](https://github.com/kubernetes/kubernetes/pull/70048), [@bart0sh](https://github.com/bart0sh))

- Kubeadm: allow RSA and ECDSA format keys in preflight check ([#112537](https://github.com/kubernetes/kubernetes/pull/112537), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

## Dependencies

### Added
_Nothing has changed._

### Changed

- You can now use kubeadm's `InitConfiguration` and `JoinConfiguration` to define which preflight errors will be ignored. ([#75499](https://github.com/kubernetes/kubernetes/pull/75499), [@marccarre](https://github.com/marccarre))

- Kubeadm: do not use a DaemonSet for the pre-pull of control-plane images during "kubeadm upgrade apply". Individual node upgrades now pull the required images using a preflight check. The flag "--image-pull-timeout" for "kubeadm upgrade apply" is now deprecated and will be removed in a future release following a GA deprecation policy. ([#90788](https://github.com/kubernetes/kubernetes/pull/90788), [@xlgao-zju](https://...