uation">.</span><span class="function"><a href="/api/metrics/interfaces/metrics/metrics/methods/listener/addmetriclistener/">addMetricListener</a></span><span class="punctuation">(</span>
  <span class="keyword">null</span><span class="punctuation">,</span>
  <span class="punctuation">(</span><span class="parameter">metrics<span class="punctuation">,</span> metricId<span class="punctuation">,</span> newMetric<span class="punctuation">,</span> oldMetric</span><span class="punctuation">)</span> <span class="o