Screenshot_2018-09-01_21-20-11.png
Example how to use the https://grafana.com/plugins/grafana-worldmap-panel with OpenNMS / PostgreSQL.
At first you have to install the worldmap panel:
# grafana-cli plugins install grafana-worldmap-panel
And create a PostgreSQL datasource of your OpenNMS database within grafana.
Don't forget to add longitude/latitude assets to your nodes!