[Observium] New device / custom graph

Greetings o/

I have an instance with observium running and am trying to add a new device/graph for it.

There seems to be little information for this. I tried looking into the mailing list archive as well at http://postman.memetic.org/pipermail/observium/ but get a 403.

So, forgive me for asking again what must be a frequent question.

My device is a PDU from "Gude" described by MIB GUDEADS-PDU818X.

I can see that there are already devices from "Gude" in the source like "Gude Expert PDU" described by GUDEADS-PDU8110-MIB but so far I have not been successful.

Are there any documents, guides or anything that you can recommend?

Any help is greatly appreciated.

Best regards, Steffen Schwebel