Revert "Revert "Add request rate (and volume) limiter. #7006""
Revert "Revert "Add request rate (and volume) limiter. #7006""

This reverts commit 9e3696bad976fed8714c20f3f98c0383d223ec52.

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor