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Little's Law Ties Throughput, Concurrency and Latency Together

The outcome requires the learner to keep a pipeline correct as volume grows, and this is the one relation that lets them size a change before making it rather than discovering the ceiling in production. It is what turns the arrival-rate/service-rate pair and the concurrency-limit node into a plan with a number attached, and it is the arithmetic behind both the batch-size trade and the partition-ceiling calculation. It is vendor-neutral and permanently true, exactly the kind of concept the fence prefers over a service feature.