I wish to hit "/controller/rest/applications/app-name/request-snapshots?time-range-type=BEFORE_NOW&duration-in-mins=60" but it doesn't seem to be working. I've tested with a REST client and it seems to work perfectly there, so I suspect that what I have in the parameter field isn't correct. There's no documentation on how to input the parameters into the proper fields when adding a new input.
What we usually do is go to that metric in the AppD UI and then right click to "copy full path" (not REST). That works for us as it converts it to a REST as part of the add-on functionality. Hope that helps!
Guessing by now you've sorted it, but responding in case others come looking so they have something to work with.