docs: def healthy(self):
  		""" Return task health. If None - task is healthy, otherwise - maximum severity of sensors
  
  		:return: None or WTaskHealthSensor.WTaskSensorSeverity
  		"""
  		state = None
  		for sensor in self._sensors.values():
  			if sensor.healthy() is False:
  				if state is None or sensor.severity().value > state.value:
  					state = sensor.severity()
  				if state == WTaskHealthSensor.WTaskSensorSeverity.critical:
  					break
  
  		return state