Check manual page of esx_vsphere_hostsystem_maintenance
|VMWare ESX Host System: Maintenance State|
|Distribution||official part of Check_MK|
OK if the ESX host has the same state since the last service detection.
CRIT if the state has changed.
The behavior can be changed by a Wato rule to force Maintenance mode or not.
See "Monitoring VMWare ESX with Checkmk" in the online documentation as well.
One service is created for each ESX Host System.