nova/releasenotes/notes/placement-rest-api-nested-r...

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---
features:
- New placement REST API microversion 1.14 is added to support nested
resource providers. Users of the placement REST API can now pass a
``in_tree=<UUID>`` parameter to the ``GET /resource_providers`` REST API
call. This will trigger the placement service to return all resource
provider records within the "provider tree" of the resource provider with
the supplied UUID value. The resource provider representation now includes
a ``parent_provider_uuid`` value that indicates the UUID of the immediate
parent resource provider, or ``null`` if the provider has no parent. For
convenience, the resource provider resource also contains a
``root_provider_uuid`` field that is populated with the UUID of the
top-most resource provider in the provider tree.