We've confirmed that all systems are back to normal with no customer impact as of 3/8, 10:18 UTC. Our logs show the incident started on 3/8, 8:58 UTC and that during the 1 hours and 20 minutes that it took to resolve the issue ~25% of customers experienced data access issue in Azure Log Analytics and Network Performance Monitor services in the West Europe region.
Root Cause: The failure was due to an issue with one of the internal service in Log analytics.
Incident Timeline: 1 Hours & 20 minutes - 03/08, 8:58 UTC through 03/08, 10:18 UTC
We understand that customers rely on Log analytics and Network Performance Monitor as critical services and apologize for any impact this incident caused.