:: Disk usage (in percent)

:: Inode usage (in percent)

:: IOstat

:: eth0 traffic

:: Netstat

:: Ping times to www.google.nl

:: Uptime

:: Postfix Mailqueue

:: Postfix message throughput

:: Postfix bytes throughput

:: Fork rate

:: Number of Processes

:: VMstat

:: HDD temperature

:: Pending packages

:: CPU usage

:: Available entropy

:: Interrupts & context switches

:: Individual interrupts

:: Load average

:: Memory usage

:: File table usage

:: Inode table usage

:: Swap in/out