You will receive a notification when there is an alarm that you need to fix. This will either be when the alarm activates (when you are in escalation level 1) or when the person on the above escalation level didn’t fix the problem. See Schedule notifications and Schedule notification sending logic - examples for more information.
When you receive the email, the first thing you need to do is to acknowledge the alarm. By doing that, you have confirmed that you will fix the problem causing the alarm. Everyone will stop receiving emails for this alarm.