* 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:
"The Great Leap" part 1, a "Batman R.I.P." tie-in! Two-Face hits New York City, but when he takes a bite out of the Big Apple, he finds it rotten to the core. He'll make Nightwing and all of New York pay for their crimes unless Nightwing can save one of Harvey Dent's old flames from an assassin's bullet!