Add tracing to franz-go

[yianni]

Hello,

We have developed a plugin[1] for franz-go that adds tracing to Kafka records and exports them to OpenTelemetry. This plugin allows tracing context propagation from upstream input into Kafka records and from Kafka records to downstream output.

We are interested in knowing if the Benthos team would like to incorporate this capability into the project. We can contribute to this feature and would be happy to work with the team. Please let us know your thoughts on this.

[1] twmb/franz-go#294

[mihaitodor]

Hey @yianni, that sounds like a nice opt-in feature to have. Feel free to send a PR once the franz-go maintainers merge your PR and tag a new release which contains your plugin.

[twmb]

(note that the plugin has been merged)

[adriangonz]

Would this supersede the extract_tracing_map field currently present on the older kafka input?