What is "Unknown message type fqdn" in VDSM logs?

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What do messages like the one below mean?

VM Channels Listener::ERROR::<DATE, TIME>::guestIF::214::vm.Vm::(_handleMessage) vmId=<VM ID>::Unknown message type fqdn

This message can be seen when the hypervisor runs the version of vdsm below. This may happen in other versions, although we have not verified that.

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