Experiencing Latency and Data Loss issue in East US - 03/17 - Resolved

[Azure-Monitor-Team]

Final Update: Wednesday, 18 March 2020 06:02 UTC

We've confirmed that all systems are back to normal with no customer impact as of 03/17, 23:10 UTC. Our logs show the incident started on 03/17, 17:46 UTC and that during the 5 hours and 24 minutes that it took to resolve the issue some in East US region may have experienced intermittent data latency, data gaps and incorrect alert activation.

• Root Cause: The failure was due to an issue in one of our dependent services.
• Incident Timeline: 5 Hours & 24 minutes - 3/17, 17:46 UTC through 3/17, 23:10 UTC

We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.

-Madhuri

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Update: Wednesday, 18 March 2020 01:43 UTC

We continue to investigate issues within Application Insights. Engineers of the backend dependency are continuing their investigation to find the root cause.

• Next Update: Before 03/18 14:00 UTC

-Eric Singleton

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Update: Tuesday, 17 March 2020 21:43 UTC

We continue to investigate issues within Application Insights. Root cause is not fully understood at this time. The issue has been confirmed to be related to a backend dependency.

• Next Update: Before 03/18 02:00 UTC

-Eric Singleton

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Initial Update: Tuesday, 17 March 2020 19:36 UTC

We are aware of issues within Application Insights and are actively investigating. Customers ingestion telemetry in East US geographical region during 17:00 UTC and 18:10 UTC may have experienced intermittent data latency, data gaps and incorrect alert activation.

• Work Around: None
• Next Update: Before 03/17 22:00 UTC

We are working hard to resolve this issue and apologize for any inconvenience.
-Eric Singleton

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