open telemetry?

[nicolasburtey]

we have had some peek some days ago where we had thousands of request per minutes, and our app went offline for a brief period. to better understand how to properly scale the backend we would like to add open telemetry and a jaeger or jaeger-equivalent to trace all the internal queries and understand which one takes longer under heavy load.

if it something you'd like add to this repo, or be ok to merge a PR if we're doing one? I have not look at GRPC with open telemetry but I think we may have this ability to trace GRPC calls without the need to change something on the lnd side, but still something to investigate.

[nicolasburtey]

@bodymindarts

[alexbosworth]

One thing you can do is create a separate lnd object that has the telemetry in it if you want to isolate things to the grpc level