SLA Alerts for Jira shows notifications at the top of your screen to inform you of breached and about to be breached (breaching) SLA timers that might require your attention. Red notifications are shown when a SLA timer has been breached. These SLAs have a timer which has reached zero and should be dealt with as soon as possible. Yellow notifications are shown when a SLA timer has reached a time specified by your administrator. These are usually are issue issues where the SLA is close to being breached. You can navigate directly to these issues by clicking on the issue name in the notification header.
When there are multiple SLA timers that require your attention you'll see arrows to the side of the alerts.
When you click on one of these arrows you'll open a dropdown containing the other alerts. If there are more than 5 alerts you can scroll through the list to view the other issues requiring your attention.
Depending on the settings specified by your administrator you might see alerts for issues assigned to other user too.