Comment 5 for bug 1737465

By the way, "track_instance_changes" doesn't really have anything to do with cells v2 unless you have a split MQ deployment where the scheduler and compute services (which are in the cells) are on different MQs - because then the computes can't RPC cast to the scheduler topic "at the top" of the deployment, as discussed here:

https://docs.openstack.org/nova/latest/user/cellsv2-layout.html