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They implied they might take some servers down to add more to their cluster.

How can someone "imply" an emergency maintenance? That would make it a planned maintenance. The servers were supposed to be operational so that people could change/place orders before trading resumes.

It's like "emergency surgery." Your doctor can say, "We're scheduling you for emergency surgery in two days or that aneurism could burst and kill you. In the mean time don't so anything stressful."

So the emergency maintenance is maintenance that, if put off, could result in the complete collapse of the system so better to do it right away and have an annoying but hopefully brief impact.

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