It seems that hosts created in and provisioned by Foreman don't have a "Model" set, as usually seen in the Hosts overview. The "Model" usually is something like "Bochs" (for KVM VMs), "PowerEdge R710" for Dell's R710 servers, "ProLiant DL380" for HP servers, and so on. Manually setting the model, by going to "Edit Host" -> "Additional Information" works, but shouldn't this be handled automatically? The "productname" fact is correctly set on all affected hosts.

Also curious: when a host that has been installed outside of Foreman is added to Foreman (by means of a Puppet report or facts pushed into Foreman) the "Model" is set correctly. Only hosts created in Foreman seem problematic.