Automatic discovery of externally added devices

An exemplary system may automatically discovery externally added devices. In one embodiment, the system obtains initial device information for a virtual machine running on a host computing system. The system determines whether an external event occurred on the host computing system. A management computing system associated with the host computing system does not receive notification of the external event. Upon determining that the external event occurred on the host computing system, the system obtains updated device information for the virtual machine running on the host computing system.