Grafana and nagios - no data. Nagflux connected

Hi, I have installed Grafana + Nagflux + Nagios. I am trying to get stats in Grafana but I cant :frowning:

In Source Data I have Nagflux connected successfully, and in Add new Dashboard I select “Nagflux” but I can’t see any data, maybe I am not using variables DB but I dont know how could I do it.