This disclosure describes techniques that include presenting a visual information that conveys information about health data associated with a large number of network devices or a large number of attributes of one or more network devices. In one example, this disclosure describes a method that includes collecting performance indicator data and determining a plurality of health status values based on a health status rule; grouping the health status values, based on how many health status values are in the plurality of health status values, into a plurality of health status groups, wherein each of the health status groups includes a subset of the health status values, and wherein each of the health status values within each subset are related to each of the other health status values in the subset; and determining, for each of the health status groups, a group health status value.