Extensions are posted the following way: `extensions.talos.dev/<name>=<version>` The name should be valid as a label (annotation) key. If the value is valid as a label value, use labels, otherwise use annotations. Also implements node annotations in the machine config as a side-effect. Fixes #9089 Fixes #8971 See #9070 Signed-off-by: Andrey Smirnov <andrey.smirnov@siderolabs.com>