f span information and invoke the span filter
  unless the span is marked as inactive (timestamp set to 0)</p>

<h3 class="function"><a name="get_span-0">get_span/0</a></h3>
<div class="spec">
<p><tt>get_span() -&gt; <a href="#type-span">span()</a></tt><br></p>
</div><p>Get the span from the process dictionary. If there is no active
  span, return an empty one with timestamp set to 0</p>

<h3 class="function"><a name="ids-0">ids/0</a></h3>
<div class="spec">
<p><tt>ids() -&gt; {<a href="#type-trace_id">trac