ections, allowing
the swarm stay well connected and peers aware of more peers in the
swarm. This extension is enabled by default unless explicitly disabled in
the <a class="reference external" href="reference-Session.html#session">session</a> constructor.</p>
<p>This can either be passed in the add_torrent_params::extensions field, or
via <a class="reference external" href="reference-Torrent_Handle.html#add_extension()">torrent_handle::add_extension()</a>.</p>
<a name="create_ut_metadata_plugin()"></a><span