We've confirmed that all systems are back to normal with no customer impact as of 11/02, 14:30 UTC. Our logs show the incident started on 11/02, 12:40 UTC and that during the 1 hour and 50 minutes that it took to resolve the issue. Customers using Azure Log Analytics and/or Sentinel in Australia South East who may have experienced intermittent query failures and delayed or missed alerts
Root Cause: The failure was due to a recent deployment task impacted instances of a backend service which became unhealthy, preventing requests from completing.
Incident Timeline: 1 Hour & 50 minutes - 11/02, 12:40 UTC through 11/02, 14:30 UTC
We understand that customers rely on Azure Log Analyticsand/or Sentinelas a critical service and apologize for any impact this incident caused.
Update: Tuesday, 02 November 2021 14:09 UTC
We continue to investigate issues within Log Analytics and/or Sentinel. Root cause is not fully understood at this time. Some customers continue to experience intermittent query failures, delayed or missed alerts. We are working to establish the start time for the issue, initial findings indicate that the problem began at <11/02 ~12:40 UTC>. We currently have no estimate for resolution.