1. A computer-implemented method for displaying performance data for a computing environment, the method comprising: determining performance states for a plurality of entities that comprise the computing environment based on values of a performance metric for the entities; displaying the computing environment as a tree comprising nodes representing the plurality of entities and edges representing parent-child relationships between the plurality of entities; and for each parent node in the tree, determining counts of one or more performance states for descendants of the parent node in the tree; and displaying a graphical representation of the determined counts while displaying the parent node.