This file is indexed.

/etc/viewvc/templates/graph.ezt is in viewvc 1.1.22-1+deb8u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[# setup page definitions]
  [define page_title]Graph of /[where][end]
  [define help_href][docroot]/help_rootview.html[end]
[# end]

[include "include/header.ezt" "graph"]
[include "include/file_header.ezt"]

<hr />

<div style="text-align:center;">
[imagemap]
<img usemap="#MyMapName"
  src="[imagesrc]" 
  alt="Revisions of [where]" />
</div>

[include "include/footer.ezt"]