Experiencing Data Gaps for Many Data Types in Azure Portal- 10/2 – Resolved

Final Update: Friday, 10/2/2015 19:01 UTC

We’ve confirmed that all systems are back to normal with no customer impact as of 10/2, 18:40 UTC. Our logs show the incident started on 10/1, 20:35 UTC and that it took to resolve the issue 1% of customers experienced data gaps across all data types.

Root Cause: The failure was due to deployment in production that caused race around condition for one of the service instance among multiple instances. As a mitigation , reboot of impacted instances fixed the issue .
Lessons Learned: 1. We plan to implement multiple checks to detect race around condition and immediate mitigation.                       2. Improvement on our monitoring system to detect the issue fast.
Incident Timeline:  21 Hours & 55 minutes - 10/1, 20:35 UTC through 10/2, 18:40 UTC

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

-Application Insights Service Delivery Team

Initial Update: Friday, 10/2/2015 18:20 UTC

We are aware of issues within Application Insights and are actively investigating. Some customers may experience Data Gaps. The following data types are affected: Availability, Customer Event, Dependency, Exception, Metric, Page Load, Page View, Performance Counter, Request, Trace.

Work Around:
Next Update: Before 20:30 UTC

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

-Application Insights Service Delivery Team


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