Hello, I tried to update kolla wallaby because new images has been released.
During the update nova_libvirt container restarted and all vm went down.
So I verified that every time I restart nova_libvirt container, all vm restarted and nova_compute reports lost connection with libvirt.
In openstack installations where docker is not used, the libvirt restart does not cause vm shutdown.

I opened a bug:

Ignazio