VMware's CIM Provider Program is open to qualified OEMs and IHVs
interested in developing CIM providers for VMware ESX. CIM Provider
partners have access to the VMware Workbench CIM Provider Development
Kit (CIM PDK) plugin, including a build environment, test framework,
and other tools. Partners interact with VMware's R&D engineers to
create and test CIM providers and to influence future enhancements to
VMware's CIM infrastructure.
In ESXi hardware status is monitored using CIM
CIM Providers
I think it's because you're using "white box" hardware.
Server-class systems provide hooks for VMWare monitoring/health status.