Check manual page of vbox_guest

VirtualBox: Linux Guest Additions

Included in	All Checkmk editions
Source Code License	Open Source
Supported Agents	Linux

This check uses VBoxControl to query the version and revision of the guest additions installed in a VirtualBox Linux guest. If no guest additions are installed at all, the check will get critical. if the version and revision of the guest additions do not match the version and revision of the virtual box host, the check will warn.

Discovery

One service is created on each Linux VBox host having guest additions installed(!). If you want to force the check on all of your Linux guests, you need to configure explicit checks using checks=.