I'm having issues with telegraph as well. I followed the same guide long ago. The .conf file that that website instructs you to use is also missing. I suspect that it would be best to figure out a new way to get everything running, but I don't want to risk losing all the data. Most of this grafana stuff is all way over my head.
I had a similar issue with my conbee stick. I had to use
serial:
adapter: deconz
port: /dev/ttyACM0
Adding the adapter seemed to help, and the amc0 worked without having to use the ID. Maybe something similar can help you