span><span class="special">(</span><span class="identifier">attribute_name</span> <span class="keyword">const</span> <span class="special">&amp;</span> channel_name<span class="special">,</span> 
                          <a class="link" href="attribute_actor.html" title="Class template attribute_actor">attribute_actor</a><span class="special">&lt;</span> <span class="identifier">SeverityT</span><span class="special">,</span> <span class="identifier">SeverityFallbackT</span><span class="special">,</span> <s