* Any code that inspects this annotation should be changed to use the new key.
      State of Initialization will continue to be reported in both pods.alpha.kubernetes.io/initialized
      and in `podStatus.conditions.{status: "True", type: Initialized}`

    * This more closely aligns rest client as a generic RESTful client, while preserving the special Kube API extended error handling for the `Get` and `Into` methods (which most Kube clients use).
* Making the pod.alpha.kubernetes.io/initialized annotation optional in PetSet pods ([#35739](https://github.com/kubernetes/kubernetes/pull/35739), [@foxish](https://github.com/foxish))