title: Grafana add Prometheus datasource, no access option
body: <p>Ok, so I'm not a devops guy.
  I downloaded the latest image of grafana (6.6.0 atm).
  Adding a prometheus data sources ended up with 502 Bad Gateway. What I've seen different than the tutorial is that there is no "Access" option anymore. Checking <code>http://localhost:3000/api/datasources/</code> I've seen that my data source has 'proxy' access by default.</p>
  
  <p><a href="https://i.stack.imgur.com/XXNmn.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XXNmn.png" alt="enter image description here"></a></p>
  
  <p>Then I switched to an older version of grafana (6.4.0) which has the possibility to change access and everything went ok.
  <a href="https://i.stack.imgur.com/kNftx.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/kNftx.png" alt="enter image description here"></a>
   Anyone knows how to select other access type in the newer versions of grafana? I checked their docs but everything seemed outdated</p>