/usr/share/puppet/modules.available/puppetlabs-apache/templates/mod/dumpio.conf.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 | # https://httpd.apache.org/docs/2.4/mod/mod_dumpio.html
DumpIOInput "<%= @dump_io_input %>"
DumpIOOutput "<%= @dump_io_output %>"
|