Final Update: Wednesday, 05 September 2018 10:00 UTC
We've confirmed that all systems are back to normal with no customer impact as of 09/05, 09:10 UTC. Our logs show the incident started on 09/05, 07:40 UTC and that during the 1 hours 30 minutes that it took to resolve the issue some of the customers in the West Europe region experienced issue in accessing the data through OMS Portal.
Root Cause: The failure was due to the recent configuration changes.
Incident Timeline: 1 Hours & 30 minutes - 09/05, 07:40 UTC through 09/05, 09:10 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.