Grafana offer the posibility to change the form that the variables are interpolate.
I just thought that being specific could help. Now I see that in the documentation this is named.
Disabling Quoting for Multi-value Variables
Grafana automatically creates a quoted, comma-separated string for multi-value variables. For example: if
server01andserver02are selected then it will be formatted as:'server01', 'server02'. Do disable quoting, use the csv formatting option for variables:
${servers:csv}Read more about variable formatting options in the Variables documentation.