We've confirmed that all systems are back to normal with no customer impact as of 09/20, 07:30 UTC. Our logs show the incident started on 09/19, 19:30 UTC and that during the 12 hours that it took to resolve the issue a very small subset of customers could have experienced delays in receiving their availability test notifications.
Root Cause: The failure was due to an issue in one of our dependent services.
Incident Timeline: 12 Hours - 09/19, 19:30 UTC through 09/20, 07:30 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
Update: Friday, 20 September 2019 04:55 UTC
We continue to investigate issues within Application Insights. Root cause is not fully understood at this time. Some customers continue to experience data latency for availability data type and may experience delays in getting their notifications. We currently have no estimate for resolution.
Work Around: None
Next Update: Before 09/20 11:00 UTC
Initial Update: Friday, 20 September 2019 01:16 UTC
We are aware of issues within Application Insights and are actively investigating. Some customers may experience Data Latency for availability data type and they may experience delays in getting their notifications.
Work Around: none.
Next Update: Before 09/20 03:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Chandar Raghavan