Change [1] in Juno added the server_groups and server_group_members quotas. Server group quota is counted per project and user [2]. Server group member quota is only counted per group and user [3]. The question coming up in IRC today is why is the server group member count not also constrained by project? Or is project implied since the member count is within the scope of a group, which is itself per-project? Note that the original change that added these quotas said, "They can be defined per project or per user within a project". Given none of the people that originally added this are around still maintaining it, nor was there a spec (we didn't have specs in Juno), we're left to guess as to the reasons. If we changed the server_group_members quota enforcement to count per group/project/user, would that break anything? [1] https://review.openstack.org/#/c/104957/ [2] https://github.com/openstack/nova/blob/caa37cf099933c5aed02dcdb256055e18479fe13/nova/api/openstack/compute/server_groups.py#L176 [3] https://github.com/openstack/nova/blob/caa37cf099933c5aed02dcdb256055e18479fe13/nova/compute/api.py#L1024 -- Thanks, Matt