We've confirmed that all systems are back to normal with no customer impact as of 09/06, 15:15 UTC. Our logs show the incident started on 09/06, 13:45 UTC and that during the 1 hours and 30 minutes that it took to resolve the issue 10% of customers using Log alerts which are configured in East US region might have experienced Alerting failure.
Root Cause: The failure was due to issues with one of our backend services.
Incident Timeline: 1 Hours & 30 minutes - 09/06, 13:45 UTC through 09/06, 15:15 UTC
We understand that customers rely on Log Search Alerts as a critical service and apologize for any impact this incident caused.
Initial Update: Friday, 06 September 2019 14:48 UTC
We are aware of issues within Log Search Alerts and are actively investigating. Some customers may experience alerting failure in East US region.
Work Around: None
Next Update: Before 09/06 18:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Rama