Final Update: Friday, 20 September 2019 10:33 UTC
We've confirmed that all systems are back to normal with no customer impact as of 09/20, 10:20 UTC. Our logs show the incident started on 09/19, 09:00 UTC and that during the 25 hours 20 minutes that it took to resolve the issue some customers in East US region might have experienced alerting delays and would not had received metric alerts.
- Root Cause: The failure was due to an issue in one of our dependent service.
- Incident Timeline: 25 Hours & 20 minutes - 09/19, 09:00 UTC through 09/20, 10:20 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
-Monish