We've confirmed that all systems are back to normal as of 03/24, 18:53 UTC. Our logs show the incident started on 03/24, 16:05 UTC and that during this time it took for us to mitigate the issue customer using Log Analytics in West US who may have experienced issues accessing your data as well as missed or delayed alerts..
Root Cause: The failure was due to weekly hotfix landed on a degraded infrastructure during deployment, which impacted a subset of Log Analytics data access..
Incident Timeline: 03/24, 16:05 UTC through 03/24, 18:26UTC
We understand that customers rely on Azure Log Analytics as a critical service and apologize for any impact this incident caused.
Initial Update: Wednesday, 24 March 2021 17:32 UTC
We are aware of issues within Log Analytics and are actively investigating. Some customers may experience delayed or missed Log Search Alerts and accessing recent data.
Work Around: None
Next Update: Before 03/24 19:00 UTC
We are working hard to resolve this issue and apologize for any inconvenience. -chandar