I got around to adding some migration support to xymon in the Mandriva packages, and it seems to work adequately for a relatively simple setup. So, I have (as usual) rebuilt the packages for RHEL/Centos.
For now, they are in a separate repo, e.g.:
http://staff.telkomsa.net/packages/rhel5/xymon/ http://staff.telkomsa.net/packages/rhel4/xymon/ http://staff.telkomsa.net/packages/rhel3/xymon/
SRPM is here: http://staff.telkomsa.net/packages/SRPMS/xymon/xymon-4.2.3-1.rhel5.src.rpm
Please note that you may see a message about files being save as .rpmsave, you should copy those back before starting xymon after the upgrade.
Also note that any extension scripts may not be migrated correctly (it's better to package them as well :-)).
If you do upgrade from Hobbit to Xymon with these packages, please let me know of anything else that did not work correctly.
If I get sufficient feedback, I will eventually move these packages to the hobbit repo (or, make them have the same content).
Regards, Buchan
P.S. I am taking a few days of paternity leave starting now ... but I will try and answer mail