/serverstate - Show the Performance Monitor stats (permissions required)
/ss - Short command for command above.
As from version 1.6.5 there are sub-commands available:
/ss reload - Reload the config
/ss time - Show only the time category
/ss memory - Show only the memory category
/ss disk - Show only the disk category
/ss backup - Show only the backup category
/ss world - Show only the world category
/ss player - Show only the player category
/ss server - Show only the server category
All category commands above will force run all checks, except the backup. This is because there are no need to filter out some features as only a smaller portion is shown. The /ss command can also be replaced with /serverstate.
Permissions:
pmonitor.showstate - Enable usage of Performance Monitor for certain users, default for Op's.