---
other:
  - |
    The ``resource_provider_generation`` parameters of the following
    methods of ``PlacementAPIClient`` are now optional:
    ``update_resource_provider_inventories``,
    ``update_resource_provider_inventory`` and
    ``update_resource_provider_traits``.
    You may call the methods without this parameter or pass ``None``
    with the meaning to ignore resource provider generations. That is the
    client will (in quick succession) get the object and update it supplying
    the same generation.