- Kubeadm: Add a preflight check that the control-plane node has at least 1700MB of RAM ([#93275](https://github.com/kubernetes/kubernetes/pull/93275), [@xlgao-zju](https://github.com/xlgao-zju)) [SIG Cluster Lifecycle]

- Added support for RSA and ECDSA format keys in preflight check on `kubeadm`. ([#112508](https://github.com/kubernetes/kubernetes/pull/112508), [@SataQiu](https://github.com/SataQiu))

### Other notable changes

* fix pdb validation bug on PodDisruptionBudgetSpec ([#48706](https://github.com/kubernetes/kubernetes/pull/48706), [@dixudx](https://github.com/dixudx))
* kubeadm: Fix join preflight check false negative ([#49825](https://github.com/kubernetes/kubernetes/pull/49825), [@erhudy](https://github.com/erhudy))

### Other notable changes

* Revert deprecation of vCenter port in vSphere Cloud Provider. ([#49689](https://github.com/kubernetes/kubernetes/pull/49689), [@divyenpatel](https://github.com/divyenpatel))
* kubeadm: Add preflight check for localhost resolution. ([#48875](https://github.com/kubernetes/kubernetes/pull/48875), [@craigtracey](https://github.com/craigtracey))

- Kubeadm: during "init" and "join" perform preflight validation on the host / node name and throw warnings if a name is not compliant ([#99194](https://github.com/kubernetes/kubernetes/pull/99194), [@pacoxu](https://github.com/pacoxu)) [SIG Cluster Lifecycle]

- Kubeadm: fixes a preflight check that can fail hostname construction in IPV6 setups ([#134589](https://github.com/kubernetes/kubernetes/pull/134589), [@liggitt](https://github.com/liggitt)) [SIG API Machinery, Auth, Cloud Provider, Cluster Lifecycle and Testing]

### Other (Cleanup or Flake)

- Kubeadm: removed `socat` and `ebtables` from kubeadm preflight checks ([#127416](https://github.com/kubernetes/kubernetes/pull/127416), [@saschagrunert](https://github.com/saschagrunert)) [SIG Cluster Lifecycle]

## Dependencies

### Added
_Nothing has changed._

- Kubeadm: allow RSA and ECDSA format keys in preflight check ([#112534](https://github.com/kubernetes/kubernetes/pull/112534), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

## Dependencies

### Added
_Nothing has changed._

### Changed

with a content type of `text/plain` containing JSON data would be accepted and the JSON data would be extracted.

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