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The fifth-largest crypto exchange has resumed service after scheduled maintenance that was supposed to take two hours but instead took days, infuriated Kraken market participants and elliciting fears of greater troubles.
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"Our system is replicated in development, where all tests passed. However when the new engine was moved to the production environment, regression tests picked up a condition that proved quite difficult to track down."
https://www.coindesk.com/kraken-exchange-is-back-online-after-troublesome-system-upgrade/
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