Multiple issues

[moutyque]

Major issues:

Filter DOES NOT save even when we save dashboard, always back to default
Grafana variables are not usable in filter, it's forwarded as ${var} string
Same dimensions are labeled as field X, leading to all series are not linked (hard to manipulate)

Minor issues:

Remove Field X to have better readability (can be treated post query with "Labels to fields" transformation)
Filter is not easy to read as it does not \n