| Interface | Description | 
|---|---|
| AlarmHistoryRepository | 
 Provides methods for querying the alarm history. 
 | 
| AlarmState | 
 Used to represent the state of an alarm at some particular point in time. 
 | 
| RelatedAlarmState | 
 Used to represent the state of a related alarm at some particular point in time. 
 | 
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