Yeah, client will use IE (with IE version set in browser emulation in windows registry).
So IE11 and that registry entry could be essential here.
There seems to be quite a lot of sharing options - http://docs.grafana.org/reference/sharing/
Perhaps the iframe in embedded html module in Xibo would work better - I’m guessing here, personally I haven’t use grafana, but I think you could try that.
As for logs, you can check player status window (press ‘i’ on your keyboard to show it) or collect more detailed player log - How to get a Windows Player log for advanced debugging