We've confirmed that all systems are back to normal with no customer impact as of 07/04, 11:30 UTC. Our logs show that the incident started on 07/04, 07:30 UTC and that during the 04 hours that it took to resolve the issue, customers in South UK region might have experienced data latency issues while accessing their data in Azure Log Analytics. Some customers would have also experienced failures in alerting in this region during the impact window.
Root Cause: The failure was due to issues in one of the backend services.
Incident Timeline: 4 Hours - 07/04, 07:30 UTC through 07/04, 11:30 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
Initial Update: Thursday, 04 July 2019 10:59 UTC
We are aware of issues within Log Analytics and are actively investigating. Some customers might be experiencing latency and data gap issues in South UK region. Customers might also be facing alerting failures in this region as well.
Work Around: None
Next Update: Before 07/04 13:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Rama