Hello Neutrinos: During the last week we have started the "journey" to deprecate "eventlet" in Neutron and the stadium projects. We have two fronts to deal with: the Neutron API and the Neutron agents. The Neutron agents are spawned using "oslo.service" ``ServiceLauncher``, based on "eventlet". It is first needed the deprecation of "eventlet" in this project. The Neutron API was still using, by default, the "eventlet" server. The migration to the WSGI module, to the detriment of the "eventlet" implementation, was required. Most of the main project APIs have already migrated. The Neutron API using ML2/OVS was already migrated to WSGI but it was not fully functional. The periodic workers were not running, at least when spawned with devstack: * https://review.opendev.org/c/openstack/devstack/+/922125 It was also noticeable the instability of some ML2/OVS tempest CI jobs. That was caused by the RPC event handler implementation in the Neutron API: * https://review.opendev.org/c/openstack/neutron/+/926922 The Neutron API using ML2/OVN was not working at all. It was first needed to refactor the way to initialize the OVN plugin: * https://review.opendev.org/c/openstack/neutron/+/922470 ML2/OVN was also missing the maintenance worker, that was not running when using WSGI: * https://review.opendev.org/c/openstack/devstack/+/922611 * https://review.opendev.org/c/openstack/neutron/+/922074 With ML2/OVN, that usually doesn't need RPC communication, was a problem with the RPC worker (my bad for so many iterations...): * https://review.opendev.org/c/openstack/devstack/+/924473 * https://review.opendev.org/c/openstack/devstack/+/924693 * https://review.opendev.org/c/openstack/devstack/+/925412 The TLS CI job running with ML2/OVN was failing too: * https://review.opendev.org/c/openstack/neutron/+/925376/ The next steps: * To test the Neutron API using ML2/OVN (that doesn't use oslo.messaging for RPC) without any "eventlet" call (at least not calling the monkey patch method). That will be a POC patch only, but enough for testing. * Once we have new versions of the oslo libraries, we'll start with the deprecation in the agents. Regards.