* 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 Critical List": When Jughead becomes over-critical of Pop Tate's food, Pop slaps the apron on Jughead and makes him work behind the counter. Pop then gives Jughead a litany of complaints about Jughead's food and service to show him what it's like... but somehow you know that Jughead will have the last laugh... and the last bite!