Setting up your first GA feed with Stitch.
See specific step-by-step instructions here - your metrics or dimensions may differ depending on your pipeline setup:
https://docs.google.com/document/d/1dCbLYJuVxhBYcfUAOieRn--1siShEgZ5Nz5GwozqEus/view#heading=h.ho3oeuqr747y