We use graphite for monitoring trends. One requirement is to spot an outlier from all nodes. So for e.g. we are monitoring apache threads at front apache and the Level2 apache. The default graph generated by graphite would show graphs but it would show all nodes in different scale. See below graph where open file handles on all nodes are shown differently
Every graph is showing data and just looking at it cant show the outliers as a graph with 2K as higher limit shows simliar to graph with 12K.
So passing yMin=0&yMax=75 to the graphite url did the trick. Here is an example of apache level2 threads.
From this clearly we can see the 3,4,7 are the outliers.