We've confirmed that all systems are back to normal with no customer impact as of 1/25, 01:22 UTC. Our logs show the incident started on 1/25, 00:14 UTC and that during the 68 minutes that it took to resolve the issue customers in UK South with workspace-enabled Application Insights resources experienced intermittent data gaps and latent data as well as possible misfiring of alerts based on such data gaps or latencies.
Root Cause: The failure was due to a backend resource that hit an operational threshold.
Incident Timeline: 68 minutes - 1/25, 00:14 UTC through 1/25, 01:22 UTC
We understand that customers rely on Application Insights as a critical service and apologize for any impact this incident caused.