Final Update: Wednesday, 18 December 2019 20:52 UTC
We've confirmed that all systems are back to normal with no customer impact at present. Our logs show the incident started on 12/18, 18:00 UTC and that during the 1 hour 15 minutes that it took to resolve the issue some customers experienced data access and alerting failures.
- Root Cause: The failure was due to memory issue in underlying infrastructure.
- Incident Timeline: 1 Hour & 15 minutes - 12/18, 18:00 UTC through 12/18, 19:15 UTC
We understand that customers rely on Azure Monitor as a critical service and apologize for any impact this incident caused.
-Arvind