Kafka source tracing

[slinkydeveloper]

Signed-off-by: Francesco Guardiani francescoguard@gmail.com

Fixes #1195

Proposed Changes

• Now KafkaSource works with tracing, using configs from knative-tracing config map. Default is no-op

[matzew]

/lgtm
/approve

[slinkydeveloper]

/hold

Something is wrong in the message writer, i don't see the traceparent extension written down the wire

[slinkydeveloper]

There is a bug in sdk-go that prevents this to be merged: cloudevents/sdk-go#499

As soon as we update sdk-go, this one is ready

[slinkydeveloper]

Let's also try to bring this one in knative/eventing#3101, so we can remove some duplicated code

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[slinkydeveloper]

/unhold

[slinkydeveloper]

/retest

[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-knative-eventing-contrib-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
kafka/source/pkg/adapter/adapter.go	30.8%	57.9%	27.1
kafka/source/pkg/adapter/message.go	78.8%	79.1%	0.3

[slinkydeveloper]

/retest

[slinkydeveloper]

/retest

[matzew]

/lgtm

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matzew, slinkydeveloper

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[knative-prow-robot]

@slinkydeveloper: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
pull-knative-eventing-contrib-build-tests	a471362	link	/test pull-knative-eventing-contrib-build-tests

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