Ways to connect mongodb to grafana
Try using MongoDB datasource for Grafana
It should allow you to hook up your MongoDB data source just fine...
Right now grafana doesn't support MongoDB as a data source Using mongoDB as back-end repository
But they offer a workaround grafana simple json data source
There's also a new MongoDB data source plugin for paid Grafana:https://grafana.com/grafana/plugins/grafana-mongodb-datasource