Proxmox monitoring clustering not working

Hi, I am trying to follow: Proxmox monitoring: How to do it efficiently with Checkmk
Unfortunately assigning interfaces to the cluster does not work. I filled out Clustered services rule as in the blog but the interfaces remain with the nodes and none appear at the cluster

The issue is, I think, the interface names. The are not names Interface fw… or Interface tap…
The blogpost mentions nothing of this

Edit: in case someone comes to this post in the future, the solution is to go to service discovery rules → Network interface and switch port discovery and create a rule with
image

Maybe the blog could be updated to reflect the necessary non-default config.