Comment 1 for bug 1796068

I'd suggest we maintain existing behaviour as default for now; would a toggle on nova-compute and neutron-gateway to use the Juju provided JUJU_AVAILABILITY_ZONE make sense? then a deployment can turn on this feature - I also think we should tie a unit of n-ovs to the same az as its parent n-compute otherwise people will get in a twist - so something like

   juju config nova-compute use-juju-availability-zones=True

would reconfigure nova-compute with a preset AZ and propagate the same value down to the neutron-openvswitch agents.

neutron-gateway would need the same option.

What's the earliest release we can support this back to?