Hi, Background: Versioned notification infra [1] is merged and on the midcycle we agreed that we don't allow new legacy notification [2]. I promised to create some automated way to detect if a new legacy notification is proposed in a review. I implemented [3] a monkey patch in the test that checks the event_type passed to the legacy notifier against a whitelist. This approach has obvious limitations when the new event_type is not detected: - if there is no test for the new event_type - if there is test but it mocks the nova.rpc.get_notifier directly [4] (fake_notifier is not a problem) To overcome these limitations I investigated if a new hacking rule can be added but I didn't find the way to detect the missing cases. The main problem is that the result of the nova.rpc.get_notifier is often wrapped, renamed and passed around. So with only syntactic information available in hacking the new calls on that notifier object is impossible to detect. I tried to monkey patch the mock library itself (I know I'm evil) to detect at least the second case but I failed. [5] Now I'm out of ideas. So any suggestion what to try next is appreciated. Cheers, Gibi [1] https://review.openstack.org/#/q/status:merged+project:openstack/nova+branch:master+topic:bp/versioned-notification-api [2] https://review.openstack.org/#/c/273506/ [3] https://review.openstack.org/#/c/276363/ [4] https://github.com/openstack/nova/blob/master/nova/tests/unit/compute/test_resource_tracker.py#L1233 [5] https://review.openstack.org/#/c/276759