Alarms are defined by a critical level and grey zone level, although greyzones are not mandatory. An example of how alerts are handled is depicted here:
The green line shows that the temperature/humidity is within the predetermined limits.
The orange line shows that the temperature/humidity is within the greyzone, which it can be for a set amount of time.
The orange dot appears when there has been a greyzone alarm.
The red line shows when the temperature/humidity has exceeded a critical limit.
The red dot shows that a critical alarm has occurred.
Looking for more information about Alarms? Check this article here.