We've confirmed that all systems are back to normal with no customer impact as of 08/17, 11:15 UTC. Our logs show the incident started on 08/17, 07:50 UTC and that during the 3 hours and 25 minutes that it took to resolve the issue customers using Activity Log Alerts in Azure China experienced issues with delayed alerts up to 2 hours and 50 minutes. Alerts would have eventually fired.
Root Cause: The failure was due to issues with one of the backend services.
Incident Timeline: 3 Hours & 25 minutes - 08/17, 07:50 UTC through 08/17, 11:15 UTC
We understand that customers rely on Activity Log Alerts as a critical service and apologize for any impact this incident caused.