E.g. https://github.com/canonical/rockcraft/blob/945051ff5a658bc1c3173a114b56fe535ee0fb45/docs/reference/rockcraft.yaml.rst?plain=1#L66 Such metadata fields will make Rockcraft create certain OCI metadata fields (like labels and annotations), but the docs are explicit about that. We should cover those details in the docs, for all yaml fields that have some sort of implicit behaviour.