/usr/share/puppet/modules.available/puppetlabs-apache/templates/vhost/_use_canonical_name.erb is in puppet-module-puppetlabs-apache 3.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | <%- if @use_canonical_name -%>
UseCanonicalName <%= @use_canonical_name %>
<%- end -%>
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