Final Update: Friday, 06 September 2019 16:29 UTC
We've confirmed that all systems are back to normal with no customer impact as of 09/06, 15:15 UTC. Our logs show the incident started on 09/06, 13:45 UTC and that during the 1 hours and 30 minutes that it took to resolve the issue 10% of customers using Log alerts which are configured in East US region might have experienced Alerting failure.
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Root Cause: The failure was due to issues with one of our backend services.
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Incident Timeline: 1 Hours & 30 minutes - 09/06, 13:45 UTC through 09/06, 15:15 UTC
We understand that customers rely on Log Search Alerts as a critical service and apologize for any impact this incident caused.
-Rama