title: How to list instances that have tag1:<anyvalue> AND tag2:<anyvalue> AND tag3:<anyvalue>
body: <p>I need to identify in my infrastructure which hosts have tag1 and tag2 and tag3.
  I'm new to datadog but it seems that when filtering I have to specify a value for a specific tag.
  I also need to identify the inverse, list hosts that have tag1 but are missing tag2 OR tag3.</p>
  
  <p>I have setup a dashboard for each of the tags, I seem to be limited by up 2 tags.
  e.g filter by -> env:dev<br>
      group by -> tag1 , tag2</p>
  
  <p>I would expect to be able to see what hosts have tag1 AND tag2 AND tag3</p>
  
  <p>And the inverse -> what hosts do not have all 3 tags.</p>