* 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:
Hendrix, Cobain, Joplin, Morrison. All belong to the '27 Club,' which admits only the most brilliant musicians and artists...and kills them dead in their 27th year. Will Garland is a famous rock guitarist, secretly unable to play for months due to a neurological disorder afflicting his left hand. He's also 27! With mad scientists, long dead rock legends and cosmic entities in his way, can he make it to 28?