We've confirmed that all systems are back to normal with no customer impact as of 02/14, 13:30 UTC. Our logs show the incident started on 02/14, 01:30 UTC and that during the 12 hours that it took to resolve the issue, customer using Azure Monitor and ITSM services may have Tickets that weren't generated by their Alerts, in West Europe region.
Root Cause: Issue due to backend service.
Incident Timeline: 12 Hours - 02/14, 01:30 UTC through 02/14, 13:30 UTC
We understand that customers rely on Azure Monitors as a critical service and apologize for any impact this incident caused.