Datasource to monitor Windows Services/Processes automatically?

From my understanding, the native WMI-based checks will make a new WMI call for each instance, so 1 WMI call for each windows service and process, hence why you see 12k of them. There are a lot of types of checks that work that way, but there is one option that will let you make one WMI call per device (if you can get all the data in one call) and extract  in bulk for all instances at once: BATCHSCRIPT. I'm not sure if it would completely help in your situation, but if you switch from native WMI to using something like a PowerShell or Groovy BatchScript, you can send one WMI query to the server and get data for all services/processes at once. Scripts do cause more load on the collector than most native checks, but 150 script instances (75*2) are likely less load then 12k WMI instances.. Actually I think the collector does WMI queries via powershell anyway, not 100% sure about that, so even less of a concern.

You can still keep the old WMI AD method and just move Collector Attributes to use batchscript.