We have successfully registered an ArcGIS Server component in ArcGIS Monitor (AGM) 2023.0 for the ArcGIS Server which is used by our portal as a hosting server (portal and hosting server are running on seperate machines).
In the AGM catalog for this component I find all services with referenced data automatically listed, geocoding + geoprocessing services too - but none of the various hosted services, which are actually running on it.
Are hosted services not recognized by the current ArcGIS Monitor?