/usr/share/puppet/modules.available/puppetlabs-apache/templates/mod/disk_cache.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 4 5 6 7 | CacheEnable disk /
CacheRoot "<%= @_cache_root %>"
CacheDirLevels 2
CacheDirLength 1
<% if @cache_ignore_headers -%>
CacheIgnoreHeaders <%= @cache_ignore_headers -%>
<% end -%>
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