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So DownDetector is down, but DownDetectorDownDetector does not detect it... We probably need one more DownDetector. (no)

Yes we do have[^1] but unfortunately it looks like not checking the integrity, just reachability.

We have one. But according to Down Detector's Down Detector's Down Detector's Down Detector, that's also down.

Well Down Detector's Down Detector isn't down...What we might need is a Down Detector's Down Detector Validator