title: grafana: empty variable fields
body: <p>Grafana version: v8.3.3 (30bb7a93ca)</p>
  <p>I've created my default prometheus datasource:</p>
  <p><a href="https://i.stack.imgur.com/SHbOm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SHbOm.png" alt="enter image description here" /></a></p>
  <p>As you can see, I'm able to make queries and get some straightforward data.</p>
  <p>By other hand, it's important to note it's getting <code>instance</code> and <code>application</code> field informed:</p>
  <p><a href="https://i.stack.imgur.com/qCj3j.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/qCj3j.png" alt="enter image description here" /></a></p>
  <p>After that, I've imported <a href="https://grafana.com/grafana/dashboards/6756" rel="nofollow noreferrer">this</a> really broad used dashboard for getting spring-boot metrics.</p>
  <p>However, nothing seems to be gathering:</p>
  <p><a href="https://i.stack.imgur.com/GNQmb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GNQmb.png" alt="enter image description here" /></a></p>
  <p><code>instance</code> field selector is empty and other panels seems to not able to get data.</p>
  <p>I've tried to inspect panel queries:</p>
  <p><a href="https://i.stack.imgur.com/psJvY.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/psJvY.png" alt="enter image description here" /></a></p>
  <p>Next query is sent: <code>expr:&quot;process_uptime_seconds{application=&quot;&quot;, instance=&quot;&quot;}&quot;</code></p>
  <p>I've tried to perform it directly on prometheus:</p>
  <p><a href="https://i.stack.imgur.com/6tiBW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6tiBW.png" alt="enter image description here" /></a></p>
  <p>If I remove query filters:</p>
  <p><a href="https://i.stack.imgur.com/Q1uDC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Q1uDC.png" alt="enter image description here" /></a></p>
  <p>If I perform it using filled query filters:</p>
  <p><a href="https://i.stack.imgur.com/aikqs.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aikqs.png" alt="enter image description here" /></a></p>
  <p>Problem is, why grafana instance and application fields are empty?</p>
  <p><strong>EDIT:</strong></p>
  <p>I've also took a look on <code>instance</code> dashboard variable:</p>
  <p><a href="https://i.stack.imgur.com/d4Fys.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/d4Fys.png" alt="enter image description here" /></a></p>
  <p>As you can see, <code>Preview of values:</code> is only <code>None</code>.</p>
  <p>After that, I've performed <code>instance</code> dashboard variable straigthforwardly on prometheus:</p>
  <p><a href="https://i.stack.imgur.com/NB9I2.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/NB9I2.png" alt="enter image description here" /></a></p>
  <p>prometheus version is: <code>2.31.1</code></p>