PASSIVE MONITORING OF VIRTUAL SYSTEMS USING EXTENSIBLE INDEXING

Aspects of the present invention provide a solution for passively monitoring a computer system. In an embodiment, an indexing agent operates on a physical server having a plurality of virtual servers. The indexing agent has a framework having a plurality of indexing layers. Each of these indexing layers is adapted to index a virtual server along a different abstraction level to extract abstraction level features indicative of changes in the virtual server. Further, each of the indexing layers has an application programming interface, which is adapted to receive one or more external indexing modules to be plugged into the framework. Each indexing module is adapted to provide instructions to the indexing agent while the indexing layer to which it is plugged is indexing the associated abstraction level of the virtual machine.