Can you be a little more specific? Are you looking for information on how to upgrade the OS for the various products?
If so, for the NetQoS products, it's pretty easy, as long as you're not changing IP addresses. The best method involves backing up the databases, installing (not upgrade, but full clean install) the OS, install the software at the same version, then restore the database. Usually I do this in parallel, using some fancy footwork to keep the IP addresses the same.
I can't speak for eHealth.