MikeSpreitzer: Extend the API priority and fairness KEP with observed request details

JobBuild
1218
08-21 18:58
pull-enhancements-verify 1165965252651651072 1165147130667470848 1165141473067274240 1165141094535532544 1164921385789689858 1164592823522037763 1164592199669649408 1164305938673307648 1164305051108249602 1164304047243530240 1164256230386962433 1164255222642511872 1164250450111762432