- Allowed setting the `hostnameOverride` field in `PodSpec` to specify any RFC 1123 DNS subdomain as the pod's hostname. The `HostnameOverride` feature gate was introduced to control enablement of this functionality. ([#132558](https://github.com/kubernetes/kubernetes/pull/132558), [@HirazawaUi](https://...

- Enabled in-place resizing of pod-level resources.  
  - Added `Resources` in `PodStatus` to capture resources set in the pod-level cgroup.  
  - Added `AllocatedResources` in `PodStatus` to capture resources requested in the `PodSpec`. ([#132919](https://github.com/kubernetes/kubernetes/pull/132919), [@ndixita](https://github.com/ndixita)) [SIG API Machinery, Apps, Architecture, Auth, CLI, Instrumentation, Node, Scheduling and Testing]

- kubeadm: make sure the extra environment variables written to a kubeadm managed PodSpec are sorted alpha-numerically by the environment variable name. ([#126743](https://github.com/kubernetes/kubernetes/pull/126743), [@neolit123](https://github.com/neolit123)) [SIG Cluster Lifecycle]

- Removed note that `hostAliases` are not supported on hostNetwork Pods from the PodSpec API. The feature has been supported since v1.8. ([#122422](https://github.com/kubernetes/kubernetes/pull/122422), [@neolit123](https://github.com/neolit123))