Coverage jobs are failing with no apparent reason

[adrcunha]

/assign @steuhs

Example:
knative/eventing-contrib#154 (comment)

GitHub links to https://gubernator.knative.dev/build/knative-prow/pr-logs/pull/knative_eventing-sources/154/pull-knative-eventing-sources-go-coverage/1072220963090731009/ which shows

Unable to load build details from gs://knative-prow/pr-logs/pull/knative_eventing-sources/154/pull-knative-eventing-sources-go-coverage/1072220963090731009

[steuhs]

There is no information on the build logged. Probably fails before the coverage binary is run. Will take a closer look later

[adrcunha]

Note that it also failed for PR 2691 in serving, so this is not an isolated case.

[steuhs]

@adrcunha If you look at knative/serving#2697, there is no build information at all. Do you have any insight regarding why it would be like that?

[adrcunha]

Looks like your job is failing at the very start. Start by finding the job in the cluster and investigating is logs.

[steuhs]

It's likely to be unrelated to coverage job. Something changed before 12:03pm, Dec 10th and then all the coverage jobs starts failing. https://prow.knative.dev/?job=pull-knative-serving-go-coverage

The behavior is similar here
https://prow.knative.dev/?job=ci-knative-build-latency

@chaodaiG has done some investigation and this PR probably cause the issue #303

@adrcunha