[flake] service create - "referenced revision not found"

[rhuss]

What version of Knative?

0.12.x

Expected Behavior

The creation of a service should always work

Actual Behavior

Sometimes (but not so seldom), in the client integration E2E tests we get the following error when creating a service:

Failed to successfully execute 
'kn service create hello --image gcr.io/knative-samples/helloworld-go -n kne2etests5': 
Execution error: stderr: 'RevisionMissing: Revision "hello-bzbty-1" 
referenced in traffic not found.

which translate to a simple service Create call (and waiting on the Ready status to become true.

More details (including logs) can be found at knative/client#544

For me, it looks like a race condition during reconciliation of a service. Is there anything we can do to analyze the error deeper ?

[rhuss]

We identified the cause as being an optimistic lock error when updating configurations --> #6784 (comment)

So, closing this.