- For `kubeadm`: support for custom imagetags for etcd images which contain build metadata, when imagetags are in the form of version_metadata. For instance, if the etcd version is v3.4.13+patch.0, the supported imagetag would be v3.4.13_patch.0 ([#100350](https://github.com/kubernetes/kubernetes/pull/100350), [@jr0d](https://github.com/jr0d))