I don't have a unique error page for a product being out of stock, how do I set up an out of stock report?

You can use the Mutation Observer in Blue Triangle to look for a message on the site that the product is out of stock, or even that the add to cart button is grayed out. Using one of these options we can make a virtual page rule in the mutation observer to observe that situation and use that new Virtual page to key off of for our Out Of Stock Report. See you CS manager for help setting that up.