Hello,
Integrations with OneFabric and "NetSight" (its not installed on a NAC appliance) are typically something that involves a Sales engagement and Professional Services, but should you want to integrate this on your own you can find the documentation on the Extranet:
https://extranet.extremenetworks.com/downloads/Pages/OneFabricConnect.aspx
Go to the Partner Resources tab.
Note that if your account doesn’t allow access to the Partner tab, then you will need to contact GTAC and get a case started etc.
Regards,
Scott Keene
Extreme GTAC