Why it matters

Admission control prevents cascading failure. Better fast fail than slow success.

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The architecture

Reject at threshold.

Little's law: L = λ · W.

Stay in stable regime.

Admission control mathThresholdqueue or latencyLittle's lawL = λWStable regimereject beyondLittle's law is the foundational relation between arrival and queue depth
Admission control math.
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How it works end to end

Queue threshold based on SLO.

Little's law bounds.

Return 429 fast.