This doesn't work for three reasons:
* A ceilometer bug https://bugzilla.redhat.com/show_bug.cgi?id=1421431
* Another ceilometer bug https://review.openstack.org/#/c/435109/
* instance_usage_audit/instance_usage_audit_period is not configured on undercloud. (I will duplicate this BZ for the nova part of this issue).

Once all of this will be fixed, the display_name will change only within on hour (because nova send the information only once per hour).

notify_on_state_change=vm_and_task_state is also missing in nova.conf

notify_on_state_change=vm_and_task_state is OK, just not placed where I though.

cherrypicked to ocata: https://review.openstack.org/#/c/439823/

Tested. The attributes are updated

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2017:1245