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Final Update: Friday, 20 November 2020 23:14 UTC

We've confirmed that all systems are back to normal with no customer impact as of 11/20, 01:15 UTC. Our logs show the incident started on 11/19, 00:25 UTC and the impact is limited to one hour time period each day during which 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: 11/19 - 00:25 UTC through 11/19, 01:30 UTC and 11/20 - 00:20 UTC through 11/20, 01:15 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.

-Saika

Update: Friday, 20 November 2020 01:11 UTC

We continue to investigate issues within Log Analytics. Root cause is not fully understood at this time. Some customers continue to experience intermittent periods during which Log Search Alerts are missed or delayed or have experienced difficulties in accessing data for resources hosted in West US2 and North Europe. We are working to establish the start time for the issue, initial findings indicate that the problem began at 11/19 00:20 UTC. We currently have no estimate for resolution.
  • Work Around: None
  • Next Update: Before 11/21 01:30 UTC
-Saika

Initial Update: Thursday, 19 November 2020 01:20 UTC

We are aware of issues within Log Analytics and are actively investigating. Some customers may experience issues with missed or delayed Log Search Alerts or experience difficulties accessing data for resources hosted in West US2 and North Europe. 
  • Work Around: None
  • Next Update: Before 11/20 01:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience.
-Saika