="special">,</span> <span class="identifier">fallback_to_none</span><span class="special">,</span> <span class="identifier">less</span><span class="special">,</span> <span class="identifier">SeverityCompareT</span><span class="special">,</span> <span class="identifier">use_std_allocator</span><span class="special">,</span> <span class="identifier">ActorT</span> <span class="special">&gt;</span> 
  <span class="identifier">channel_severity_filter</span><span class="special">(</span><a class="link" href="attr