unction</a></li>
      <li><a href="dart-developer/TimelineSyncFunction.html">TimelineSyncFunction</a></li>
    
    </ol>
  </div>

  <div id="dartdoc-main-content" class="col-xs-12 col-sm-9 col-md-8 main-content">
      <div><h1><span class="kind-class">Metric</span> class </h1></div>

    <section class="desc markdown">
      <p>Abstract <a href="dart-developer/Metric-class.html">Metric</a> class. Metric names must be unique, are hierarchical,
and use periods as separators. For example, 'a.b.c'. Uniquene