Discovery, maintenance, and representation of entities in a managed system environment are described. Apparatus described herein includes one or more agents that run on respective serves that are managed within a management system, and that generate discovery data in response to a discovery rule. The apparatus also includes a management server that is adapted to transmit the discovery rules for execution by the agent, and to receive the discovery data from the agent. Methods described herein include defining the rules for discovering data about an entity on the server, and receiving the discovery data in response to the rule being executed in an environment in which the entity is deployed. Several types of user interfaces for presenting the discovery data are also disclosed.