For now, if you ask for a VM.export, VDI.export, VM stats (using RRDs), XAPI will return the host IP address (seems to be the host.address field in XAPI).
But for security reasons (certificates), users should be able to get FQDN instead of IP. However, we didn't find where to change this.
Changing the host.address field works but doesn't survive a host reboot. What is (if any) the "official" way to use FQDN instead of IP?