Description of problem:

Currently downwardMetrics uses a virtio-disk to be configured for the VM to retrieve the information from the Host/Node. SAP have complained that this is not secure and would like a virtio-serial channel instead like in RHV.

Request from a customer:

SAP have deprecated the disk-based metrics solution for new virtualization certifications because it collects the metrics of all VMs in a single file on the host and exposes it as a virtual disk to all VMs so that all VMs can see other VMs metrics (which may be regarded as an information leak or security risk).
The virtio-serial channel was added to the vhostmd upstream project: https://github.com/vhostmd/vhostmd. See the README file for configuration details.

How reproducible:
In RHV it is possible to implement this method (see vhostmd info).
It should also be made possible to do this in CNV.