First published on MSDN on Sep 13, 2018
Between Sep 10 16:30 UTC and Sep 11 23:50 UTC, customers may have experienced querying stale data with the Log analytics services hosted in the WCUS region.  The occurrence was due to issue in one of our dependent platform services, The issue got mitigated once our DevOps team fixed the anomalies existed in the dependent service.

We apologize for any inconvenience.

-Monish