1. A method for monitoring the performance of an enterprise performance, wherein the enterprise comprises one or more computer systems, comprising: receiving a plurality of metrics from at least one of the one or more computer systems, wherein each metric represents a measurement of a system resource of the computer system from which they are received; determining if the metrics indicate a power-tail behavior by— performing a first analytic test on a first portion of the metrics, performing a second analytic test on a second portion of the metrics and combining the results of the first and second analytic tests to determine a likelihood of said power-tail behavior; and modeling at least one characteristic of the enterprise based on said determining if the metrics indicate a likelihood of power-tail behavior.