We've confirmed that all systems are back to normal with no customer impact as of 1/10, 17:38 UTC. Our logs show the incident started on 1/10, 16:26 UTC and that during the approximately 1 hour that it took to resolve the issue customers would have experienced gaps in their data from this time frame as well as possible latency in data arrival.
Root Cause: The failure was due to a backend service that became unhealthy. Traffic was re-routed around the unhealthy services.
Incident Timeline: 1 Hours & 12 minutes - 1/10, 16:26 UTC through M/D, 17:38 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.
Initial Update: Friday, 10 January 2020 17:40 UTC
We are aware of issues within Application Insights and are actively investigating. Some customers in Brazil South may experience Data ingestion Latency.
Next Update: Before 01/10 20:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Jeff