Final Update: Thursday, 12 December 2019 08:47 UTC
We've confirmed that all systems are back to normal with no customer impact as of 12/12, 05:43 UTC. Our logs show the incident started on 12/12, 02:30 UTC and that during the 3 hours 13 minutes that it took to resolve the issue some of the customers in South East Asia Region may had experienced data access issue in the azure portal and queries from API might had failed for Log analytics, might had experienced alert failures and latency in alerting for Log Search alerts.
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Root Cause: The failure was due to an issue with one of our dependency service.
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Incident Timeline: 3 Hours & 13 minutes - 12/12, 02:30 UTC through 12/12, 05:43 UTC
We understand that customers rely on Log Analytics and Log Search Alerts as a critical services and apologize for any impact this incident caused.
-Monish