It would be very helpful if there was a tool that would tell me which ArcGIS Server services are currently accessing a specific feature class. When I need to make a schema change, I end up having to stop all of my services to do it.
Our Admin Tools for ArcGIS Online (Pro) & Portal will show you item dependencies in this fashion. You can even print out the hierarchy so that you can reference it later. Here is a video that gives you a very quick run down - https://youtu.be/S1CvjZrWn3M