/usr/share/mercurial/templates/monoblue/changelogentry.tmpl is in mercurial-common 2.8.2-1ubuntu1.
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 | <h3 class="changelog"><a class="title" href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}">{desc|strip|firstline|escape|nonempty}<span class="logtags"> {inbranch%inbranchtag}{branches%branchtag}{tags%tagtag}{bookmarks%bookmarktag}</span></a></h3>
<ul class="changelog-entry">
<li class="age">{date|rfc822date}</li>
<li>by <span class="name">{author|obfuscate}</span> <span class="revdate">[{date|rfc822date}] rev {rev}</span></li>
<li class="description">{desc|strip|escape|websub|addbreaks|nonempty}</li>
</ul>
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