code: def get_comment_brok(self, host_name, service_name=''):
          
          data = self.serialize()
          data['host'] = host_name
          if service_name:
              data['service'] = service_name
  
          return Brok({'type': 'comment', 'data': data})
docs: Get a comment brok
  
          :param host_name:
          :param service_name:
          :return: brok with wanted data
          :rtype: alignak.brok.Brok