Hi there,
I was expecting /etc/machine-id to be unique for every install, but it is static which was very unexpected (I use it as the basis of machine-specific identifier which should have been globally unique).
fixing it up was easy enough:
rm -f /etc/machine-id
rm -f /var/lib/dbus/machine-id
dbus-uuidgen --ensure
systemd-machine-id-setup
Shouldn't this be done when the root fs is being resized on the first boot?