[keystone][openstack-helm][kolla] Is it safe to run the Keystone wsgi application in multiple threads?

Hi Keystone team, I am writing to ask someone from the Keystone team to give their opinion regarding whether it is safe to run the Keystone wsgi app in multiple threads in the same process. I see [1] Kolla team allows users to configure the number of processes but not the number of threads. We in Openstack-Helm have a similar review request [2] and we had a small discussion about this. I would really appreciate it if someone from the Keystone team can give their opinion on [2]. Thanks. [1] https://opendev.org/openstack/kolla-ansible/src/branch/master/ansible/roles/... [2] https://review.opendev.org/c/openstack/openstack-helm/+/971751 -- Best regards, Kozhukalov Vladimir