Reporting in SCOM is all about choosing the right target, choose the wrong one or choose it in the wrong way and you get nothing in return. When working with windows computers the trick is to target the Windows Computer class as a group.
The only alerts that do not show up this way are the ones related to the health service watcher. Think failed to connect to computer. This is because Health Service Watcher does not ‘roll up’ to windows computer. To target this we need to filter our results to show us only health service watcher class objects.
This way of targeting (adding windows computer objects as a group) works for performance monitoring works as well.