Monitoring historical server resource usage on linux?
neondiet: Where I'm working at the moment we use Zabbix to monitor system availability and collect performance and trend data for 184 servers [that generate 8701 monitored items of data].
The Zabbix folk do all their development on Ubuntu and it's their preferred platform; but it works just as well on Redhat, CentOS, etc and has client agents for a wide variety of platforms.