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When you view the details of the alert via any of the applications (web or mobile), Jira Service Management stops sending notifications to you for that alert. For example, if you have a notification rule for an SMS to be sent after 2 minutes and if you view the alert details via the web UI within 2 minutes, Jira Service Management will not notify you through SMS. Learn how the alert notifications flow.
Activity log
Jira Service Management tracks and logs all the alert activity. Select the Activity log on the alert details page to view the logs. You can run a variety of actions in response to an alert - add a note to the alert, assign it to another user, acknowledge it, snooze the notifications, or run other actions including custom actions you add. The activity log also includes information on the actions you run.