Implement Authentication Header in Simple Json

Please have a look at this which should explain how the simple json plugin works: Grafana simplejson dashboard

Seems to me you’re trying to use as the url when configuring simple json datasource. That don’t work. To use the simple json datasource you probably need to have a service in between which receives request from simple json datasource, do a request to and then translate and return a response that simple json datasource understands. The service in between is where you’ll put the logic for authenticating with opsgenie, like custom http headers.