Final Update: Monday, 13 August 2018 18:29 UTC
We've confirmed that all systems are back to normal with no customer impact as of 8/13, 17:50 UTC. Our logs show the incident started on 8/13, 09:50 UTC and that during the 8 hours that it took to resolve the issue , customers in South UK location would have experienced data latency.
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Root Cause: The failure was due to issues with configuration of one of our back-end service.
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Incident Timeline: 8 Hours - 8/13, 09:50 UTC through 8/13, 17:50 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
-Praveen