If your project uses the MechanismDriver class or associated constants in neutron.plugins.ml2.driver_api, please read on. If not, it's probably safe to delete this message. For details on what's been rehomed, please see [1]. Suggested actions: - If you're a stadium project, you should be already covered with [2]. - If not and your project uses any of the rehomed code [1], please update your imports to use the neutron-lib version. We can discuss when to land the neutron patch that removes the rehomed code [3] in our weekly neutron meeting. Thanks [1] https://review.openstack.org/#/c/428997/ [2] https://review.openstack.org/#/q/message:%22+use+MechanismDriver+from+neutron-lib%22 [3] https://review.openstack.org/#/c/462731