lib/rack/insight/views/panels/speedtracer/serverevent.html.erb
<div class="traceblock">
<%=operation['label']%> - <%=range['duration']%>ms (self: <%=self_time%>ms)
<% unless children.empty? %>
<ul>
<% children.each do |child|%>
<li><%=child.to_html%></li>
<%end%>
</ul>
<% end %>
</div>