Previously, every call to policy.enforce passed an empty dictionary as the target. This prevented operators from using tenant specific restrictions in their policy.json files since the target would always be an empty dictionary. If you tried to restrict some actions so an image owner (users with the correct tenant id) could perform actions, the check categorically failed because the target is okay is an empty dictionary. With this update, you can pass the ImageTarget instance wrapping an Image to the enforcer so these rules can be used and properly enforced. You can now properly grant access to the image owner(s) based on tenant (e.g., owner:%(tenant)). Without this fix, the only check that actually works in Image service is a RoleCheck (e.g., role:admin).