title: Adding different metricies in grafana from prometheus
body: <p>I have different metrices in prometheus <code>counter_metrics a</code>, <code>couneter_metrices b</code> and I want a singlestat for the count of all the different request metrics.</p>
  
  <p>How am I able to fetch this?</p>
  
  <pre><code>(sum(couneter_metrics{instance="a,job="b"}))+
  </code></pre>