* 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:
What's in the box that Freddy and Mouse discovered? What's in the box that Bigby and Fly have delivered back to Frau Totenkinder? What's in the box being buried up at the Farm? And finally, how is that causing everything to come loose in Fabletown and beyond? "The Dark Ages" part 2.