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Current capacity might not be referring to actual current point in time provisioned capacity but an estimate of how much the overall infra can handle over the next few days.

No idea but ultimately this is marketing. If you wanna say we are just using as much as we need that's impressive to engineers but would it require or warrant a dedicated widget there that hovers around some sort of fixed utilization ratio?

Saying "look we are processing this much but could easily handle more" you are impressing a larger group. So my guess it's more about that.