CPU/IO/RAM/Network monitoring in system tray for Kubuntu

Question

I am looking for an application that adds CPU/IO/RAM/Network monitoring in the system tray and works with Kubuntu.

E.g. on Mac OS X I use MenuMeters:

Answer 1

You can add plasma widgets to your panel, next to the system tray. Here is mine (I'm using Plasma 4 but I think they are also present in the new Plasma 5):

The widgets are:

• CPU Monitor
• Memory Status
• Network Monitor

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To add plasma widgets to your panel:

Then select which widget you want to add: