We've confirmed that all systems are back to normal with no customer impact as of 06/23, 12:06 UTC. Our logs show the incident started on 06/23, 09:24 UTC and that during the 2 hours and 30 minutes that it took to resolve the issue 7% of customers in East US experienced data access issue Azure portal and when queried through API..
Root Cause: The failure was due to an issue in one of our dependent service.
Incident Timeline: 2 Hours & 30 minutes - 06/23, 09:24 UTC through 06/23, 12:06 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, 23 June 2019 10:43 UTC
We are aware of issues within Log Analytics and are actively investigating. Some customers in the East US region may experience data access issue and deteriorated query performance.
Next Update: Before 06/23 14:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Monish