First published on MSDN on Dec 02, 2018
Final Update: Sunday, 02 December 2018 19:00 UTC

We've confirmed that all systems are back to normal with no customer impact as of 12/02, 18:30 UTC. Our logs show the incident started on 12/02, 09:00 UTC and that during the 9 hours and 30 minutes that it took to resolve the issue most of customers in Europe region might have experienced data access issues in Azure and OMS Portal for Log Analytics.
Root Cause: The failure was due to issue in one of our back end services.
Incident Timeline: 9 Hours & 30 minutes - 12/02, 09:00 UTC through 12/02, 18:30 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.

Initial Update: Sunday, 02 December 2018 17:44 UTC

We are aware of issues within Log Analytics and are actively investigating. Some customers in Europe region may experience data access issue in Azure and OMS Portal for Log Analytics.
Work Around: None
Next Update: Before 12/02 20:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience.