graphite-project/graphite-web — pull request #549 by nickryand (2013-12-21 00:56:59+00:00)
Title: Added aggregateLine function.

This function allows you to draw a line at the 'min', 'max', or 'avg' value for a particular series.

Caveat: You have to consolidate your data accordingly when using 'min' or 'max'. By default graphite consolidates by a series by averaging the series. This is controlled with the consolidateBy() function.