Well @adorfer, I’ve done some more digging into how check_mk works with regards to plugins. I added the plugin to my Proxmox server and confirmed that the plugin is sending data to WATO. What I’m missing was the check_mk check file being added to my check_mk server.
I looked in your github repos and found the check file and added this to my check_mk server. I restarted check_mk and I can now see the details from the qemu plugin with no issue.
Thanks again for providing this plugin for us to use.