* 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:
Featuring Catwoman, Blue Devil and Cyborg! Catwoman's blamed for the theft of Trigote's "Three Triangles" painting, even though it was already gone when she came to the museum to steal it. Plus: Blue Devil in "Speak of the Devil" and Cyborg in "A Mind is a Terrible Thing!"