* 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:
During the CRISIS ON INFINITE EARTHS, Barry Allen--a.k.a. The Flash--made the ultimate sacrifice and gave his life to save millions. In his stead, the world welcomes the new Fastest Man Alive, as Wally West picks up his mentor's mantle. Long live the Flash!