---
other:
    For out-of-tree drivers that have `vendor passthru methods
    <https://docs.openstack.org/ironic/latest/contributor/vendor-passthru.html>`_.
    The ``async`` parameter of the ``passthru`` and ``driver_passthru``
    decorators is deprecated and will be removed in the Stein cycle.
    Please use its replacement instead, the ``async_call`` parameter.
    For more information, see `bug 1751306
    <https://storyboard.openstack.org/#!/story/1751306>`_.