I see what we are trying to do here, but i don't believe this is the right way to do it.
If someone was to add a graphite url or other related graphite context to their plugin, then they would get the processor graphite url instead of the graphite url they were expecting. 

Does it work for your environment if instead we changed the two $GLOBALS['GRAPHITE_URL'] instances in Check::getData to the $GLOBALS['PROCESSOR_GRAPHITE_URL'];  ?  Seems like we'd be able to remove this line from the processor, while getting the same results.

Please test it out and update the pull request if it works.

Thanks!