* 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:
Captain America, Iron Man, the Black Widow, Thor, the Vision, Nova, and the Invisible Woman...a powerful collective of the greatest heroes the world has ever known. They are the Avengers, and they want it known they're here to stay. But when Magneto and his Brotherhood of Mutants threaten to destroy several major cities unless their demands for mutant supremacy are met, the Avengers are forced to quit looking to the future, and start hoping to live through the day!