* The alpha Initializers feature, `admissionregistration.k8s.io/v1alpha1` API version, `Initializers` admission plugin, and use of the `metadata.initializers` API field have been removed. Discontinue use of the alpha feature and delete any existing `InitializerConfiguration` API objects before upgrading. The `metadata.initializers` field will be removed in a future release. ([#72972](https://github.com/kubernetes/kubernetes/pull/72972), [@l...

*   KMS: Alpha integration with GCP KMS was removed in favor of a future out-of-process extension point. Discontinue use of the GCP KMS integration and ensure [data has been decrypted](https://kubernetes.io/docs/tasks/administer-cluster/encrypt-data/#decrypting-all-data) (or reencrypted with a different provider) before upgrading ([#54759](https://github.com/...