1. A method for using overload information for managing network virtualization, the method comprising: at a virtualization orchestrator (VO) for managing virtual networks within a telecommunications network and comprising a hardware processor: receiving Diameter overload information; determining a network virtualization operation to perform based on the received Diameter overload information, wherein determining the network virtualization operation to perform comprises using a rules engine for analyzing the received Diameter overload information and status of a current network topology of the telecommunications network and identifying the network virtualization operation to be performed based on the Diameter overload information and the status of the current network topology; and performing the network virtualization operation to direct the telecommunications network to deploy additional resources to mitigate a Diameter overload indicated by the Diameter overload information by deploying, in response to the Diameter overload indicated by the Diameter overload information, one or more additional virtual gateways or one or more additional virtual switches or both in the telecommunications network using one or more network virtualization modules.