* 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:
ZAP! POW! BAM! -- are sound effects you may actually see in this series, as John Byrne returns to his roots with a brand-new superhero series. Their code names are simple ONE, TWO and THREE, but the world calls them ROCK, PAPER and SCISSORS. Together, they are Trio.