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when will we drop 2.1 officially?
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2.1 should be removed actually. At least according to our default 18-month support rule, it ended support in June 2018, and I see no desire for a 2.1.4 release. 2.2 will end in Jan 2019 according to the same guideline. It's not a hard rule, but probably the right guidance to follow.
Certainly, as this test takes a while and can be flaky I'd like to keep it to 3 versions.