docs: def get_authority(config, metrics, rrset_channel, **kwargs):
      """Get a GCEAuthority client.
  
      A factory function that validates configuration and creates a
      proper GCEAuthority.
  
      Args:
          config (dict): GCEAuthority related configuration.
          metrics (obj): :interface:`IMetricRelay` implementation.
          rrset_channel (asyncio.Queue): Queue used for sending messages
              to the reconciler plugin.
          kw (dict): Additional keyword arguments to pass to the
              Authority.
      Returns:
          A :class:`GCEAuthority` instance.
      """
      builder = authority.GCEAuthorityBuilder(
          config, metrics, rrset_channel, **kwargs)
      return builder.build_authority()