description: >
    Implement to provide critical class sensor thresholds.  Objects implementing
    Sensor.Threshold.Critical must be instantiated in the correct hierarchy within
    the sensors namespace.  The following sensor hierarchies are recognized:
      temperature
      fan_tach
      voltage
      altitude

    Additionally, any object implementing Sensor.Threshold.Critical must also
    implement Sensor.Value.

properties:
    - name: CriticalHigh
      type: int64
      description: >
          The upper bound of the critical threshold.
    - name: CriticalLow
      type: int64
      description: >
          The lower bound of the critical threshold.
    - name: CriticalAlarm
      type: boolean
      description: >
          True if the sensor value has exceeded the defined bounds.
          False if the sensor value has not exceeded the defined bounds.

          CriticalAlarm may be set to False to clear an alarm condition.
          The behavior of setting CriticalAlarm to True is undefined.

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