- Extended resources requested by initContainers which are allocated using an automatic ResourceClaim now match the behavior of legacy device plugins, reusing the same resources requested by later sidecar initContainers or regular containers when possible, to minimize the total number of devices requested by the pod. ([#134882](https://github.com/kubernetes/kubernetes/pull/134882),...

- Support in-place pod resize of running non-sidecar initContainers. ([#137352](https://github.com/kubernetes/kubernetes/pull/137352), [@natasha41575](https://github.com/natasha41575)) [SIG API Machinery, Apps, Autoscaling, Node, Scheduling, Storage and Testing]

- Added support for in-place vertical scaling of Pods with sidecars (containers defined within `initContainers` where the `restartPolicy` is set to `Always`). ([#128367](https://github.com/kubernetes/kubernetes/pull/128367), [@vivzbansal](https://github.com/vivzbansal)) [SIG API Machinery, Apps, CLI, Node, Scheduling and Testing]

- Added `--keep-*` flags to `kubectl debug`, which enables to control the removal
  of probes, labels, annotations and initContainers from copy pod. ([#123149](https://github.com/kubernetes/kubernetes/pull/123149), [@mochizuki875](https://github.com/mochizuki875)) [SIG CLI and Testing]