I'm having an issue with one of several monitored (2024.1.1) ArcGIS Server sites, where one of the sites is returning infrastructure metrics but no longer returning ArcGIS Server metrics. When I go to the Observers page for that site, the "Metrics - ArcGIS Server" observer is showing "no data" and the log returns "Failed to read ArcGIS Server usage report".
This site was working properly up until I patched (OS and ArcGIS Server) on the two ArcGIS Server VM machines and the associated web adapter VM machine last night.
The other ArcGIS Server sites are being monitored properly after the patching, just this one is misbehaving.
Any tips on how to troubleshoot this?