From within the Alarm Log, or the Alarm email alerts, you can view more details of a specific alarm. This will show the Alarm detail page.
On this page, you can acknowledge the alarm, and post comments on it, which are captured in the event log for that alarm.
Once acknowledged, you can mark the alarm as Valid or Invalid, and continue to add comments
Marking the alarm as Valid or Invalid will allow you to select a reason and add further comments
Thereafter you can close the alarm, and see a full history of the actions and comments in reverse chronological order -