Hi Nova team, I wonder there is an official Nova way to manage Flavor's visibility. The is_public flag can manage a flavor is visible to all users or not, but it can't block user to use the flavor. Usecase: - Cloud admin sets up some custom flavor for users, but the custom flavors are not available to all users at beginning. - Cloud user needs to get some approval to use the custom flavor before using the custom flavor. - Cloud system needs to show custom flavor list not approved yet to cloud users. The problem is user can only see flavors which are already gotten approval. If not, they can't see custom flavor's list using flavor list API. It's kind of chicken and egg problem. Flavors being visible to cloud user means the cloud user can create an instance using the visible flavor. best regards, Masahito