* 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 Dream-Quest of Ted Newbarn"
Theodore "Ted" Newbarn is a real "Regular Joe." He likes fast cars, chocolate cake, Huey Lewis AND The News. He also has a torso filled with angry black tentacles and an unkillable demon for a baby. And as soon as he figures all that out-- man, oh man, things are gonna BURN.