title: Grafana dashboard isn't populating any data (using Node exporter)
body: <p>I'm trying create Grafana dashboard to monitor our infrastructure, installed and configured Grafana, Prometheus. (using 1860 prebuilt dashboard)</p>
  <p>configured/created datasource is fine, yet every graph is showing NA(not available?).</p>
  <p>Grafana 7.3.7 | Prometheus 2.1.0+ds | Node Exporter 0.15.2+ds</p>
  <p>Is there anything that I'm missing here, any help/pointers please.</p>
  <p>followed this article - <a href="https://oastic.com/posts/how-to-monitor-an-ubuntu-server-with-grafana-prometheus/" rel="nofollow noreferrer">https://oastic.com/posts/how-to-monitor-an-ubuntu-server-with-grafana-prometheus/</a>.</p>