Comment 1 for bug 1849557

# find /etc/cloud
/etc/cloud
/etc/cloud/cloud.cfg.d
/etc/cloud/cloud.cfg.d/05_logging.cfg
/etc/cloud/cloud.cfg.d/README
/etc/cloud/cloud.cfg.d/90_dpkg.cfg
/etc/cloud/build.info
/etc/cloud/cloud.cfg
/etc/cloud/templates
/etc/cloud/templates/chef_client.rb.tmpl
/etc/cloud/templates/ntp.conf.sles.tmpl
/etc/cloud/templates/hosts.freebsd.tmpl
/etc/cloud/templates/timesyncd.conf.tmpl
/etc/cloud/templates/chrony.conf.fedora.tmpl
/etc/cloud/templates/chrony.conf.sles.tmpl
/etc/cloud/templates/ntp.conf.fedora.tmpl
/etc/cloud/templates/hosts.redhat.tmpl
/etc/cloud/templates/hosts.debian.tmpl
/etc/cloud/templates/chrony.conf.opensuse.tmpl
/etc/cloud/templates/sources.list.ubuntu.tmpl
/etc/cloud/templates/chrony.conf.ubuntu.tmpl
/etc/cloud/templates/ntp.conf.debian.tmpl
/etc/cloud/templates/hosts.suse.tmpl
/etc/cloud/templates/chrony.conf.rhel.tmpl
/etc/cloud/templates/ntp.conf.opensuse.tmpl
/etc/cloud/templates/ntp.conf.rhel.tmpl
/etc/cloud/templates/sources.list.debian.tmpl
/etc/cloud/templates/chrony.conf.debian.tmpl
/etc/cloud/templates/ntp.conf.ubuntu.tmpl
/etc/cloud/templates/resolv.conf.tmpl

templates could go to /usr/share, the rest are expected to be writable, save build.info; but that's part of the image build rather than cloud-init owned/generated files.