Let's say I have a custom user timing in Google Analytics, which represents the time it takes for each page to load all the images above the fold (or a variety of other metrics). Since the images on each page are different, the average value for this across all pages isn't as useful for the average value for all samples on a specific URL or across pages which share a similar template.
The URL of the page each timing was collected from, doesn't appear to be an option under dimensions.
Is it possible to make a report that groups timings by URL or Content Group?