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cc-by photo by ISAF Public AffairsSlack is a large and complex piece of software that’s been added to and changed many times over the last five years. We added features, grew to 10,000,000 DAUs, and made major architectural changes. We made assumptions and tested them with processes that often resembled science.Whenever we launch features or make changes, we test the fault tolerance of that new code. Unfortunately, we seldom get to repeat these tests as the environment continues to change around...