1. In an electronic environment that makes electronic computing resources available to users, a method of tracking usage of the electronic computing resources by the users, the method comprising: receiving data indicative of usage of the electronic computing resources by the users; storing the received data in a table, the table including multiple entries and multiple fields, the fields including a set of metric fields, each entry pertaining to a level of user class of a user class hierarchy and including a metric value for at least one of the metric fields of the table; and for a first set of the multiple entries in the table, performing an aggregation operation that aggregates metric values stored in a second set of the multiple entries in the table for at least one metric field of the set of metric fields to generate a set of aggregated metric values, wherein the first set of the multiple entries pertains to a particular level of the user class hierarchy and the second set of the multiple entries includes entries pertaining to a set of levels of the user class hierarchy subordinate to the particular level of the user class hierarchy.