We've confirmed that all systems are back to normal with no customer impact as of 07/28, 15:14 UTC. Our logs show the incident started on 07/28, 13:48 UTC and that during the 1 hour 26 min that it took to resolve the issue, customers using Azure Monitor in Brazil South East experienced data access, data latency, data gaps, missed or delayed alerts and incorrect alert activation while ingesting telemetry. Customer also experienced issues with missed or delayed alerts.
Root Cause: The failure was due to backend service becoming unhealthy.
Incident Timeline: 1 Hour & 26 minutes - 07/28, 13:48 UTC through 07/28, 15:14 UTC
We understand that customers rely on Azure Monitor as a critical service and apologize for any impact this incident caused.
Initial Update: Wednesday, 28 July 2021 15:07 UTC
We are aware of issues within Application Insights and are actively investigating. Some customers may experience data access issue and issues with missed or delayed alerts in Brazil South East region.
Work Around: None
Next Update: Before 07/28 19:30 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Vyom