I would like to know "am I above the ___th percentile for any timeout metric" right now vs. last week / month / etc. I am just getting started with Graphite an

I would like to know "am I above the ___th percentile for any timeout metric" right now vs. last week / month / etc. I am just getting started with Graphite and wondering how to do this across all of the timeout metrics at the same time on the same graph. (It would probably be an all-or-nothing scenario but there is a chance only a portion of the system is affected by something...)