This can happen per-unittest-suite as they become reliably green.
I didn't file bugs for all of them because of bug 650650 comment 1, but you'll find that probably all of the talos suites, certainly tp4m and tsspider, hit unrecognized output format (and failed to initialize browser, and whatever that other one is) too often to be visible on mozilla-central.
bug 663197 doesn't seem to know it, but it hit production, unhid mochitest-1, and browser-chrome :)
There was already enough Android failure leaking out that people had become accustomed to either dealing with it or ignoring it, whichever suited them. I unhid all the rest, and nobody even knows when.
Status: NEW → RESOLVED
Last Resolved: 7 years ago
Resolution: --- → FIXED
Product: mozilla.org → Release Engineering
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