code: def _health_check_thread(self):
          
          while self._run_health_checker:
              response = self._health_check(Health_pb2.HealthCheckRequest(service='predix-event-hub.grpc.health'))
              logging.debug('received health check: ' + str(response))
              time.sleep(30)
          return
docs: Health checker thread that pings the service every 30 seconds
          :return: None