WIP: start of opentracing support

ePaul commented 5 years ago

A first concept of the opentracing support requested in #105.

All existing tests are currently running, but I didn't test the new functionality at all, and it likely doesn't work yet.

We introduce an abstraction layer around the opentracing tracer, as we don't want to add a hard dependency (and need only three methods).
Then the event log writer creates spans (which hopefully get their calling spans as parents), extracts the span context from them and stores it together with the rest of the event data into the database.
The event transmitter then puts it into the event metadata which is sent to Nakadi.

TODO:

[ ] write actual tests for this – both with no available tracer and a tracer as spring bean
[ ] expand the database schema (Flyway migration)
[ ] add some documentation

otrosien commented 2 years ago

Fahrschein has OpenTracing and OpenTelemetry support starting with 0.24.0 ( https://github.com/zalando-nakadi/fahrschein/pull/360 )

ePaul commented 1 year ago

Yeah, I guess we should now do the same thing with OpenTelemetry.

zalando-nakadi / nakadi-producer-spring-boot-starter