title: How to use request parameter value in Grafana query string
body: <p>I am using Grafana and my URL string is like:</p>
  
  <pre><code>http://servername:3000/dashboard/db/dashboard?refresh=10s&amp;node=hanoi
  </code></pre>
  
  <p>How can i use the value of node i.e. "hanoi" in my Grafana Query string. </p>
  
  <pre><code>SELECT count("value") FROM "autogen"."sensor" WHERE "system_id" = 'hanoi' AND $timeFilter GROUP BY time(1m) fill(null)
  </code></pre>
  
  <p>Above 'hard coded' query for 'hanoi' is working fine, but i want to use node value passed as request parameter in my where clause of query string. </p>
  
  <p>I can see that refresh value i.e. 10s is passed and used successfully by Grafana dashboard. How can i use/pick the node value in my query string?</p>