code: def deliver_indication(self, indication, host):
          
          for callback in self._callbacks:
              try:
                  callback(indication, host)
              except Exception as exc:  # pylint: disable=broad-except
                  self.logger.log(logging.ERROR, "Indication delivery callback "
                                  "function raised %s: %s",
                                  exc.__class__.__name__, exc)
docs: This function is called by the listener threads for each received
          indication. It is not supposed to be called by the user.
  
          It delivers the indication to all callback functions that have been
          added to the listener.
  
          If a callback function raises any exception this is logged as an error
          using the listener logger and the next registered callback function is
          called.
  
          Parameters:
  
            indication (:class:`~pywbem.CIMInstance`):
              Representation of the CIM indication to be delivered.
  
            host (:term:`string`):
              Host name or IP address of WBEM server sending the indication.