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Discourse 2.4.0beta2 was released this Monday:
At least for this prototype phase, we will try to update Discourse a week after the latest beta version is released. With this approach we aim to follow the latest upstream version from a close distance, but not so close as to stumble onto post-release inconsistencies (it happened to us already once, last week).
Therefore, we plan to update Discourse around 2019-07-22T07:00:00Z. There will be a (hopefully short) period when this site will be down.