nova/releasenotes/notes/scheduler-upcalls-with-isol...

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---
issues:
- |
In deployments with multiple (v2) cells, upcalls from the computes to the scheduler
(or other control services) cannot occur. This prevents certain things from happening,
such as the track_instance_changes updates, as well as the late affinity checks for
server groups. See the related documentation on the `scheduler.track_instance_changes`
and `workarounds.disable_group_policy_check_upcall` configuration options for more
details. Single-cell deployments without any MQ isolation will continue to operate as
they have for the time being.