:: Apache accesses

:: Apache processes

:: Apache volume

:: Disk IOs per device

:: Disk latency per device

:: Disk throughput per device

:: Disk usage in percent

:: Disk utilization per device

:: Inode usage in percent

:: IO Service time

:: IOstat

:: S.M.A.R.T values for drive sda

:: S.M.A.R.T values for drive sdb

:: S.M.A.R.T values for drive sdc

:: S.M.A.R.T values for drive sdd

:: Exim mail throughput

:: Exim Mailqueue

:: Connections through firewall

:: eth0 errors

:: eth0 traffic

:: eth1 errors

:: eth1 traffic

:: ipconntrack

:: Netstat

:: Passenger memory

:: Passenger processes

:: Passenger queues

:: Passenger requests

:: PostgreSQL bgwriter

:: PostgreSQL buffer cache (owl)

:: PostgreSQL checkpoints

:: PostgreSQL connections (owl)

:: PostgreSQL connections per database

:: PostgreSQL connections per user

:: PostgreSQL database size (owl)

:: PostgreSQL locks (owl)

:: PostgreSQL query length (owl)

:: PostgreSQL scan types (owl)

:: PostgreSQL transaction log

:: PostgreSQL transactions (owl)

:: PostgreSQL tuple access (owl)

:: Fork rate

:: Number of threads

:: Processes

:: Processes priority

:: VMstat

:: Fan speeds based on IPMI

:: Machine temperature based on IPMI

:: Available entropy

:: CPU frequency scaling

:: CPU usage

:: File table usage

:: Individual interrupts

:: Inode table usage

:: Interrupts and context switches

:: Load average

:: Logged in users

:: Memory usage

:: Swap in/out

:: Uptime

:: NTP kernel PLL estimated error (secs)

:: NTP kernel PLL frequency (ppm + 0)

:: NTP kernel PLL offset (secs)

:: NTP timing statistics for system peer