values and
  timestamp set to 0.</p>

<h3 class="function"><a name="log-2">log/2</a></h3>
<div class="spec">
<p><tt>log(Text::<a href="#type-info">info()</a>, Service::<a href="#type-service">service()</a>) -&gt; <a href="#type-span">span()</a></tt><br></p>
</div><p>Add a log with specific service to the span in the process
  dictionary. If the span is not active, a "fake" span is returned with
  the default values and timestamp set to 0.</p>

<h3 class="function"><a name="put_span-1">put_span/1</a></h3>
<d