n class="special">,</span>                                                                     <a class="co" name="log.detailed.sink_frontends.async.c2" href="sink_frontends.html#log.detailed.sink_frontends.async.c3"><img src="../../../../../../doc/src/images/callouts/2.png" alt="2" border="0"></a>
        <span class="identifier">sinks</span><span class="special">::</span><span class="identifier">drop_on_overflow</span>                                                  <a class="co" name="log.detailed.sink_