Final Update: Wednesday, 18 November 2020 01:36 UTC
We've confirmed that all systems are back to normal with no customer impact as of 11/18, 01:15 UTC. Our logs show the incident started on 11/18, 00:20 UTC and that during the 55 minutes that it took to resolve the issue some customers might have experienced issues with missed or delayed Log Search Alerts or experienced difficulties accessing data for resources hosted in West US2 and North Europe.
Root Cause: The failure was due to an issue in one of our backend services.
Incident Timeline: 55 minutes - 11/18, 00:20 UTC through 11/18, 01:15 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.