We've confirmed that all systems are back to normal with no customer impact as of 03/30, 18:00 UTC. Our logs show the incident started on 03/30, 16:00 UTC and that during the 2 hours that it took to resolve the issue some customers experienced issues with query failures and failed alerting in Australia South East Region for Log Analytics.
Root Cause: The failure was due to issue with one of the backend services.
Incident Timeline: 2 Hours - 03/30, 16:00 UTC through 03/30, 18:00 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
Initial Update: Monday, 30 March 2020 18:18 UTC
We are aware of issues within Log Analytics and are actively investigating. Some customers may experience query failures and issues with false/incorrect alerts in Australia South East Region.
Work Around: none
Next Update: Before 03/30 22:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Jayadev