nova/releasenotes/notes/availability-zone-placement-filter-0006c9895853c9bc.yaml

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---
features:
- |
The scheduler can now use placement to more efficiently query for hosts within
an availability zone. This requires that a host aggregate is created in nova
with the ``availability_zone`` key set, and the same aggregate is created in
placement with an identical UUID. The
``[scheduler]/query_placement_for_availability_zone`` config option enables
this behavior and, if enabled, eliminates the need for the
``AvailabilityZoneFilter`` to be enabled.