Pipeline passed with warnings, but no warning anywhere

Summary

Pipeline passes with warnings. But there is no warning in the build log.

Gitlab 8.17.4 Runner 1.11.1

Steps to reproduce

It only happens on one client instance https://gitlab.zendesk.com/agent/tickets/69954

What is the expected correct behavior?

It should either pass without warnings, or display those warnings.

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of: sudo gitlab-rake gitlab:env:info)

Results of GitLab application Check

(For installations with omnibus-gitlab package run and paste the output of: sudo gitlab-rake gitlab:check SANITIZE=true)