* The kube-apiserver `--storage-version` flag has been removed; you must use `--storage-versions` instead. ([#61453](https://github.com/kubernetes/kubernetes/pull/61453), [@hzxuzhonghu](https://github.com/hzxuzhonghu))
* Authors of aggregated API servers must not rely on authorization being done by the kube-apiserver, and must do delegated authorization in addition. ([#61349](https://github.com/kubernetes/kubernetes/pull/61349), [@sttts](https://github.com/sttts))

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