title: grafana to record last highest value in graph and singlestat
body: <p>I am using Prometheus as Datasource for Grafana. </p>
  
  <p>I am receiving number of records only once a day at a particular time. </p>
  
  <ol>
  <li>Display the number of file received for that day . I did wrote query as : sum(increase(query[24h])) . 
  But the graph or singlestat reduces as over time. 
  I need to display only show the value in that particular time data is coming . Because for the rest of the time it is null . </li>
  </ol>
  
  <p>I did wrote query as : sum(increase(query[24h])) . </p>
  
  <p>sum(increase(query[24h]))</p>