Returns the existing packet names.

        :rtype: ~collections.Iterable[str]

def list_packet_names(self):
        """
        Returns the existing packet names.

        :rtype: ~collections.Iterable[str]
        """
        # Server does not do pagination on listings of this resource.
        # Return an iterator anyway for similarity with other API methods
        path = '/archive/{}/packet-names'.format(self._instance)
        response = self._client.get_proto(path=path)
        message = archive_pb2.GetPacketNamesResponse()
        message.ParseFromString(response.content)
        names = getattr(message, 'name')
        return iter(names)