/etc/cloud/templates/timesyncd.conf.tmpl is in cloud-init 18.2-14-g6d48d265-0ubuntu1.
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 | ## template:jinja
# cloud-init generated file
# See timesyncd.conf(5) for details.
[Time]
{% if servers or pools -%}
NTP={% for host in servers|list + pools|list %}{{ host }} {% endfor -%}
{% endif -%}
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