Rooky question : use URL parameters

Hi all,

I use Grafana 4.6.3 and I’ve made my first dasboard, so I’m a beginer.
In this dashboard I put a “drilldown / detail link” to open another dashboard.

So the second dashboard have an URL like this :

I try to get the value of the url parameter called “var-server” to use it in a template variable but I don’t understand how to do that ?

Help wanted !!!

I’ve made so much tries that it couldn’t work in this state.
I’ve start with a clean new one and it works.