We've confirmed that all systems are back to normal with no customer impact as of 6/9, 00:30 UTC. Our logs show the incident started on 6/8, 21:15 UTC and that during the 3 hours and 15 minutes that it took to resolve the issue customers experienced delayed Activity Log alerts by up to 3.5 hours.
Root Cause: The failure was due to the service reaching an operating limit as a result of large unexpected spike in alert notifications across regions.
Incident Timeline: 3 Hours & 15 minutes - 6/8, 21:15 UTC through 6/9, 00:30 UTC
We understand that customers rely on Activity Log Alerts as a critical service and apologize for any impact this incident caused
Initial Update: Monday, 08 June 2020 23:49 UTC
We are aware of issues within Activity Log Alerts and are actively investigating. Some customers may experience delayed alerts. Alerts will eventually fire.
Next Update: Before 06/09 04:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Subhash