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, selected by a user, over a selected time interval 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 leaf node in the tree, comparing the values of the performance metric against one or more state-specific threshold values to determine the performance states for each leaf node; displaying a circular ring comprising an indicator for a performance state associated with the leaf node; for each parent node in the tree, determining counts of each of one or more performance states associated with every leaf nodes under the parent node; displaying a circular ring comprising an outer ring and an inner ring, wherein the outer ring comprises visually distinct sections associated with each of the one or more performance states, wherein the visually distinct sections are sized proportionately with the determined counts for each of the associated performance states; and displaying an identifier for a type of entity that is represented by the parent node, and an indicator of the performance state of the parent node within the inner ring, wherein the performance state is determined based on a worst performance state of any child node under the parent node.