hi! i want to a/b test the relevance of my menu links, ie how well they link to pages that contain products my visitors are interested of. i have metrics for "open menu", "clicked menu item", "viewed product list", "product click", "add to cart", "purchase" etc. what is the best way to create relevance for measuring if the changes a/b tested in our menu have positive impact on things like add to cart, purchase etc?