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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

We are going to need to document this in the nova cells devref as
something to consider when doing multi-cell deployment.

** Tags added: cells doc

** Also affects: devstack
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1700496

Title:
  Notifications are emitted per-cell instead of globally

Status in devstack:
  New
Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  With https://review.openstack.org/#/c/436094/ we began using different transport URLs for Nova internal services.
  That said, as notifications emit on a different topic but use the same transport URL than the component, it leads to our consumers missing notifications as they only subscribe to the original MQ.

  While Nova can use multiple MQs, we should still offer the possibility
  to have global notifications for Nova so a consumer wouldn't require
  to modify their configs every time a new cell is issued.

  That can be an oslo.messaging config option [1], but we certainly need
  to be more gentle in Devstack or depending jobs (like for Vitrage)
  could fail.

  [1]
  https://docs.openstack.org/developer/oslo.messaging/opts.html#oslo_messaging_notifications.transport_url

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