/usr/share/doc/ganeti-instance-debootstrap/examples/hosts is in ganeti-instance-debootstrap 0.16-3ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | #!/bin/sh
#
# This is an example script that sets the hostname and hosts file.
VMFQDN=$INSTANCE_NAME
VMHOSTNAME=${VMFQDN%%.*}
[ x$VMFQDN -eq x$VMHOSTNAME ] && VMFQDN=""
echo "127.0.1.1 $VMFQDN $VMHOSTNAME" >> $TARGET/etc/host
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