nova/releasenotes/notes/placement-forbidden-traits-...

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---
features:
- |
Placement microversion '1.22' adds support for expressing traits which are
forbidden when filtering ``GET /resource_providers`` or ``GET
/allocation_candidates``. A forbidden trait is a properly formatted trait
in the existing ``required`` parameter, prefixed by a ``!``. For example
``required=!STORAGE_DISK_SSD`` asks that the results not include any
resource providers that provide solid state disk.