E2E Test - Trace through Broker

[Harwayne]

Problem
Once #1708 and #1756 are finished, tracing through a Broker will work. To ensure it continues to work, we need an E2E test that verifies it.

Persona:
Contributor

Exit Criteria
A test in the e2e suite that runs before every PR merge. The test verifies that an event sent to the Broker has at least the following spans appear in the same trace:

• Event sent to the Broker.
• Event sent to each Trigger.
• Event sent to each Trigger's Subscriber.
• Any replies back from the Subscribers that are sent through the Broker again.

[Harwayne]

/project Observability To do

[daisy-ycguo]

Designed use case by Harwayne:

In particular, write an e2e test that sets up:

• Broker.
• EventSender Pod to send an event of type foo to the Broker.
• Logger Pod + K8s Service.
  • Trigger on the Broker pointing to this Pod, filtering on event type bar.
• Event Mutator Pod (I think this will be a new test_image) + K8s Service. This will reply with an event of type bar.
  • Trigger on the Broker pointing to this Pod, fitler on event type foo.

Then send the event, and ensure the desired number of spans are present, 11.

• EventSender Pod to Broker Ingress.
• Broker Ingress to Trigger Channel.
• Trigger Channel to Trigger 1.
• Trigger Channel to Trigger 2.
• Trigger 1 to event mutator.
• Trigger 1 response to Ingress Channel.
• Ingress Channel to Broker Ingress.
• Broker Ingress to Trigger Channel.
• Trigger Channel to Trigger 1.
• Trigger Channel to Trigger 2.
• Trigger 2 to logger.

Assign myself to work on this.
/assign daisy-ycguo

[Harwayne]

/milestone v0.10.0

[n3wscott]

/close

We have broker tracing tests now at ./test/conformance/broker_tracing_test.go

[knative-prow-robot]

@n3wscott: Closing this issue.

In response to this:

/close

We have broker tracing tests now at ./test/conformance/broker_tracing_test.go

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