Initially, Metadata had only the EditorSettings, and HasMetadata was used to understand if the incoming update request had metadata in the body because it could be omitted if it was empty. For example, when the rule is updated via the provisioning API or has only false values. If it was in the request, we used that; if not, we used the metadata from the existing rule from the database. If the rule was updated via the AlertRuleService, we didn't change Metadata at all if the rule already existed.
But now, Metadata also has the Prometheus rule definition, and we always need to update it with the new version of the AlertRuleService when the rule exists in the DB and has the same UID. HasMetadata is renamed to HasEditorSettings to keep the old behaviour only for EditorSettings.
Now, the provisioning API and the conversion API will overwrite everything except EditorSettings with the new data.
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