You can actually interrogate emacs for this information C-h k (mouseclick) in the stacktrace buffer should tell you which function is called. Then check C-h m in the stacktrace buffer to see all key maps active in that buffer (so that you can see if something conflicts with ,gd)

Then bind ,gd to do what you want

This confused me as well, I expected RET to work but it did not (probably because of something else in my setup)