1. A method in a computer system comprising: receiving, at the computer system, a signature, wherein the signature is represented by a sub-graph; defining a start node, wherein the start node is defined based on a condition of a component of a data center, the condition is determined based on a relationship between the start node and a next node of the data center, and the relationship between the start node and the next node is defined by an edge; and determining, using a processor of the computer system, if the data center is over-provisioned or under-provisioned, wherein the determining comprises matching the sub-graph and a portion of a main graph based on the condition and the signature, and a failure to match the sub-graph and at least the portion of the main graph indicates that the data center is either over-provisioned or under-provisioned.