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docs: add release-note fragment for PR #2123 #2159

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elevran merged 1 commit into from
Jul 23, 2026
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docs: add release-note fragment for PR #2123 #2159

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7 changes: 7 additions & 0 deletions release-notes.d/unreleased/2123.md
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---
pr: 2123
url: https://github.com/llm-d/llm-d-router/pull/2123
author: LukeAVanDrie
date: 2026-07-23
---
Flow control queueing is now bounded by default: `defaultRequestTTL` defaults to 60s and per-band `maxRequests` defaults to 5000 when unset. For existing flow control users this is a behavior change: an explicit `defaultRequestTTL: "0s"` disables the TTL (requests then wait until client disconnect), and a band `maxRequests`/`maxBytes` of 0 is treated as unset and receives the default. To approximate the legacy fast-fail behavior for sheddable traffic, configure a small `defaultNegativePriorityBand.maxRequests`. Scale-to-zero deployments should raise `defaultRequestTTL` above the expected cold-start time.
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