/usr/share/mercurial/templates/gitweb/changelogentry.tmpl is in mercurial-common 3.7.3-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<a class="title" href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}"><span class="age">{date|rfc822date}</span>{desc|strip|firstline|escape|nonempty}<span class="logtags"> {inbranch%inbranchtag}{branches%branchtag}{tags%tagtag}{bookmarks%bookmarktag}</span></a>
</div>
<div class="title_text">
<div class="log_link">
<a href="{url|urlescape}rev/{node|short}{sessionvars%urlparameter}">changeset</a><br/>
</div>
<i>{author|obfuscate} [{date|rfc822date}] rev {rev}</i><br/>
</div>
<div class="log_body">
{desc|strip|escape|websub|addbreaks|nonempty}
<br/>
<br/>
</div>
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