/usr/lib/tmpfiles.d/certmonger.conf is in certmonger 0.74-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # certmonger uses libraries which may want to put temporary files in $TMPDIR,
# but SELinux policy won't let anything running as certmonger_t do that
d /var/run/certmonger 0755 root root
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