code: def set_metadata(self, queue, metadata, clear=False):
          
          uri = "/%s/%s/metadata" % (self.uri_base, utils.get_id(queue))
          if clear:
              curr = {}
          else:
              curr = self.get_metadata(queue)
          curr.update(metadata)
          resp, resp_body = self.api.method_put(uri, body=curr)
docs: Accepts a dictionary and adds that to the specified queue's metadata.
          If the 'clear' argument is passed as True, any existing metadata is
          replaced with the new metadata.