Some questions...
1) Do you have the previous contents of 50-cloud-init.cfg?
2) Did you make modifications to the file, and they were "reverted"?
3) Did you reboot, or was it just an `apt-get dist-upgrade` that you ran?
4) Please also attach what the cloud-init version was before and after your apt-upgrade attempt.
Some questions...
1) Do you have the previous contents of 50-cloud-init.cfg?
2) Did you make modifications to the file, and they were "reverted"?
3) Did you reboot, or was it just an `apt-get dist-upgrade` that you ran?
4) Please also attach what the cloud-init version was before and after your apt-upgrade attempt.