1. A method comprising: identifying network management objects associated with a managed network device that are available in a first management application in the managed network device, the network management objects not included in an existing management information base (MIB) associated with the managed network device, the first management application configured for handling network management objects that are not included in the existing MIB; including the identified network management objects in a new MIB; generating a first policy file for association with the new MIB based on the identified network management objects, wherein the first policy file is generated outside the existing MIB and includes policies used for obtaining values of the identified network management objects from the first management application; loading the new MIB on the managed network device, including loading the first policy file on the managed network device; receiving, at the managed network device, a query from a managing network device for a value of a network management object included in the new MIB; and responsive to receiving the query: extracting, using the first policy file, the queried value from the first management application; converting, using the first policy file, the extracted value to a syntax that is compatible with a second management application associated with the managing network device; and populating, using the first policy file, the new MIB with the converted value during runtime of the managed network device.