datagraph/rack-throttle — pull request #9 by lbeder (2014-04-10 08:17:53+00:00)
Title: Fixed request start time detection when New Relic is involved.

Check whether HTTP_X_REQUEST_START or HTTP_X_QUEUE_START exist then parse its value (for example, when having New Relic in your stack, it's going to be in the "t=\d+" format)