The change had Code-Review +2 by Amir and Verified -1 by Jenkins.

The recheck event did match:

zuul.IndependentPipelineManager:
Event <TriggerEvent comment-added mediawiki/extensions/OAuth master 500177,4 Verified:0, Code-Review:0>
for change <Change 0x7fadd72a98d0 500177,4>
matched <EventFilter types: comment-added branches: (?!^refs/meta/config) ignore_deletes: True
^^^^^^^^
         comments: (?im)^Patch Set \d+:( -?Code\-Review(\+|-)?(1|2)?)?(\n\n\(\d+ comment(s)?\))?\n\n\s*recheck\b 
         emails: <bunch of emails>>
in pipeline <IndependentPipelineManager test>

But the test pipeline rejects it because it has a Code-Review+2:

2019-05-14 09:38:52,349 INFO zuul.Scheduler:
  Adding mediawiki/extensions/OAuth, <Change 0x7fadd72a98d0 500177,4> to <Pipeline test>
2019-05-14 09:38:52,349 DEBUG zuul.IndependentPipelineManager:
  Considering adding change <Change 0x7fadd72a98d0 500177,4>
2019-05-14 09:38:52,349 DEBUG zuul.IndependentPipelineManager:
  Change <Change 0x7fadd72a98d0 500177,4>
  does not match pipeline requirement <ChangeishFilter reject_approvals: [{'code-review': 2}]>
  ^^^^^^^^^^^^^^

That is due to T105474 / 0f0aecfb695e668786ac9847dfed63f79d8fcca6 which made test to reject Code-Review +2 changes.

The event is not processed by gate-and-submit because it only accepts comments that do have a Code-Review +2. If Amir had done a recheck that would have enqueued it.

Same issue as T223209

Change 510148 had a related patch set uploaded (by Hashar; owner: Hashar):
[integration/config@master] Revert "zuul: skip test/test-prio for CR+2 changes"

https://gerrit.wikimedia.org/r/510148

Change 510148 merged by jenkins-bot:
[integration/config@master] Revert "zuul: skip test/test-prio for CR+2 changes"

https://gerrit.wikimedia.org/r/510148

Oh no :( in my opinion the recheck convenience was totally worth this small regression!

(but perhaps the other regression was more significant, I wouldn’t know about that)

Well both were annoying regressions, albeit little ones so I guess it was better to just revert :-] Eventually I will come again to the problem and figure out a proper solution.