Comment 3 for bug 1803019

Reviewed: https://review.openstack.org/617426
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-os_nova/commit/?id=822f19fc3d7f53e922ef8bffa30da36e924d9f41
Submitter: Zuul
Branch: master

commit 822f19fc3d7f53e922ef8bffa30da36e924d9f41
Author: KimMinSik <email address hidden>
Date: Tue Nov 13 11:39:57 2018 +0900

    Nova generates versioned_notifications but no one consume

    Nova generates versioned_notifications but no one consume even
    ceilometer. versioned_notification queues will continuously
    increase if there is no consumer.

    https://docs.openstack.org/nova/latest/configuration/config.html#notifications
    https://docs.openstack.org/nova/latest/reference/notifications.html
    We can set notification_format to 'unversioned'
    in the nova.conf

    Change-Id: Id990633fb1816b3506778ccc0a9ae76bcb588e86
    Closes-Bug: #1803019