* Client-Side Metrics Include
* Wiki: https://tiny.amazon.com/cpso0wg6
* Needs to be included at the top of pages because it tracks latency--
* ue_t0 needs to be as close to body load as possible.
* - ue.tag maps to URLType dimension of OnlineQueryLog in PMET. Because we cannot add
* custome data to other dimensions in PMET through CSM, we are replicating it thrice to
* cover each store, page type, and the intersections of the two.
* - Whitelists are listed in the usage guide:
What does Johnny Boo do when there's nothing to do? Johnny Boo Does Something! In fact, he does a LOT of things!
Watch Johnny Boo have a Boring Adventure and discover Yawn Power, write an angry letter to Ice Cream Magazine, get a squiggly new hairdo, fall to the bottom of Ice Cream Hole #25, and celebrate the maybe-birthday of his pet ghost Squiggle, all adding up to the most inventive Johnny Boo book yet.