We've confirmed that all systems are back to normal with no customer impact as of 09/13, 03:35 UTC. Our logs show the incident started on 09/13, 01:46 UTC and that during the 1 hour 49 minutes that it took to resolve the issue some customers from West US2 region may have experienced log processing delays with OMS workspaces hosted in this region.
Root Cause: The failure was due to performance issue with one of our backend service.
Incident Timeline: 1 Hour & 49 minutes - 09/13, 01:46 UTC through 09/13, 03:35 UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
Initial Update: Friday, 13 September 2019 02:31 UTC
We are aware of a data latency issue in West US2 region with Azure Log Analytics and are actively investigating. Some customers may experience delay in accessing their data and potentially receive delayed alerts .
Next Update: Before 09/13 07:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -Subhash