Discrete and Prometheus change updateting from grafana 6 to 7

Hello,

I update today my grafana server from 6.7.2 to 7.0.5.

When I checked my dashboards to know whats OK or NOK I found that my “discrete” panel visualization don’t have the same behavior.

To place into context I check the response of some of my internal website with blackbox exporter and prometheus. The previous behavior was that on each line of the discrete panel I had the “instance” name, and now I have the word “Value” for all lines.

There are 2 screenshots for more understanding (the panel settings, options, legend are strictly the same, the dashboard variables as well)

In grafana 6.7.2

In grafana 7.0.5

Is someone have an idea for what I need to do to have the same behavior ?

Thanks
Luc