What tools do you advise for managing running daemons? This includes:
- Load monitoring: renice a daemon when it slows down the whole server
- Keeping alive: restart it when it's not functional. Maybe, connectivity checks?
- Any advanced log processing/rotation/parsing tools?
- Handy error notifications: e-mail, icq, jabber, ...
- Realtime monitoring: munin || nagios, for sure! :) Maybe there's something else nice enough to be used?
- ... other suggestions?