https://github.com/knative/eventing/pull/2388 manual reproductionEventing
I've manage to reproduce errors on a GCP Kubernetes cluster identical to the one used in Prow.
Below are test results. There ware 10 lost events, 505 total.
In other files are errors that I've noticed, and fetched with Stackdriver Log Viewer UI.
020-01-17T17:47:26.585+0100 INFO prober/verify.go:35 Fetched receiver report. Events propagated: 495. State: failed