We've confirmed that all systems are back to normal with no customer impact as of 06/25, 22:34 UTC. Our logs show the incident started on 06/25, 21:40 UTC and that during the ~1 hour that it took to resolve the issue subset of Fairfax customers whose cache expired experienced data access issues in Log analytics.
Root Cause: The failure was due to incorrect configuration.
Incident Timeline: 1 Hour , 06/25, 21:40 UTC through 06/25, 22:34 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
Initial Update: Tuesday, 25 June 2019 22:32 UTC
We are aware of issues within Log Analytics and are actively investigating. Subset of Fairfax customers whose cache has expired may experience data access issue.
Work Around: None
Next Update: Before 06/26 01:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Anupama