1. A method for assessing computer system performance, the method comprising: receiving a first probe value determined from execution of a broad spectrum probe in an execution environment; in response to determining that the first probe value is not a first expected probe value, initiating execution of a targeted probe, the targeted probe providing a second probe value associated with at least one member of the group consisting of a subsystem of the execution environment, a feature of the subsystem, and a component of the execution environment, wherein the second probe value is based, at least in part, on at least one hardware metric; and in response to determining that the second probe value is not a second expected probe value, determining, based at least in part, on a differential between the second probe value and the second expected probe value that a bottleneck exists in at least one of the subsystem of the execution environment, the feature of the subsystem, or the component of the execution environment.