- 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),...

- E2e test for PodFsGroupChangePolicy ([#96247](https://github.com/kubernetes/kubernetes/pull/96247), [@saikat-royc](https://github.com/saikat-royc)) [SIG Storage and Testing]
- Ephemeral containers now apply the same API defaults as initContainers and containers ([#94896](https://github.com/kubernetes/kubernetes/pull/94896), [@wawa0210](https://github.com/wawa0210)) [SIG Apps and CLI]
- Graduate the Pod Resources API to G.A

* The deprecated alpha and beta initContainer annotations are no longer supported. Init containers must be specified using the initContainers field in the pod spec. ([#51816](https://github.com/kubernetes/kubernetes/pull/51816), [@liggitt](https://github.com/liggitt))

* The deprecated alpha and beta initContainer annotations are no longer supported. Init containers must be specified using the initContainers field in the pod spec. ([#51816](https://github.com/kubernetes/kubernetes/pull/51816), [@liggitt](https://github.com/liggitt))

- 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]

* Restores the ability of older clients to delete and scale jobs with initContainers. ([#59880](https://github.com/kubernetes/kubernetes/pull/59880), [@liggitt](https://github.com/liggitt))

- Fix `EndpointSlice` describe panic when an Endpoint doesn't have zone. ([#101025](https://github.com/kubernetes/kubernetes/pull/101025), [@tnqn](https://github.com/tnqn))
- Fix `kubectl set env` or `resources` not working for initcontainers. ([#101669](https://github.com/kubernetes/kubernetes/pull/101669), [@carlory](https://github.com/carlory))

- 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]

* The GitRepo volume type is deprecated. To provision a container with a git repo, mount an `EmptyDir` into an `InitContainer` that clones the repo using git, then mount the `EmptyDir` into the Pod's container.
([#63445](https://github.com/kubernetes/kubernetes/pull/63445), [@ericchiang](https://github.com/ericchiang))

- InitContainer's image location will be considered in scheduling when prioritizing nodes. ([#123366](https://github.com/kubernetes/kubernetes/pull/123366), [@kerthcet](https://github.com/kerthcet)) [SIG Scheduling]