def v2_deprecated(f):
    """No-op decorator in preparation for deprecating Identity API v2.

    This is a placeholder for the pending deprecation of v2. The implementation
    of this decorator can be replaced with::

        from sidserver.openstack.common import versionutils


        v2_deprecated = versionutils.deprecated(
            what='v2 API',
            as_of=versionutils.deprecated.JUNO,
            in_favor_of='v3 API')

    """
    return f