feat: add negative ack redelivery delay and backoff support (PIP-106)#419

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abbudao wants to merge 67 commits into

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gorilainvest:nack-backoff

Commits on May 29, 2026

test(02-01): add failing tests for negative ack backoff

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feat(02-01): implement negative ack backoff math

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feat(02-01): expose negative ack backoff at crate root

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Commits on May 30, 2026

Commits on Jun 1, 2026

test(04-01): add failing negative ack delay selection tests

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feat(04-01): implement negative ack delay selection

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test(04-01): add failing negative ack tracker operation tests

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feat(04-01): implement negative ack tracker operations

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test(04-02): add failing engine config plumbing tests

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feat(04-02): pass negative ack config into engine

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test(04-02): add failing engine delayed nack runtime assertions

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feat(04-02): integrate delayed negative ack runtime

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test(04-03): add failing runtime docs compatibility assertions

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docs(04-03): document negative ack runtime semantics

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refactor(04-03): gate tracker test helpers

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fix(04-03): satisfy validation scope guards

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test(04-03): assert reconnect preserves pending nacks

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fix(04): address negative ack code review findings

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fix(04): clear delayed nack after immediate redelivery

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fix(04): avoid duplicate nack backoff evaluation

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fix(04): remove nacks from unacked timeout tracker

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fix(04): harden negative ack retry semantics

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fix(04): address nack follow-up review

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test(05-01): add bounded negative-ack tracker regression tests

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test(05-01): guard negative-ack DLQ separation

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test(05-01): prove negative-ack config across consumer flavors

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test(05-01): bound DLQ tests with short nack delay

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test(05-02): add negative ack usage example

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docs(05-02): document negative ack delay migration

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fix(05): WR-01 reject unrepresentable nack delay

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fix(05): WR-02 add topic consumer config seam

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fix(05): WR-03 replace DLQ source checks with behavior tests

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fix(05): WR-04 compile alternate negative ack examples

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fix(05): WR-03 return reader regex error instead of panicking

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fix(05): WR-01 exercise consumer construction config paths

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fix(05): WR-02 add engine effect seam for nack DLQ tests

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fix(05): tighten review fix behavior seams

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fix(05): preserve regex consumer with single topic

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fix(05): clear cumulative ack redelivery entries

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fix(05): clean ack state after broker ack succeeds

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fix(05): test ack cleanup with effect seam

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Commits on Jun 2, 2026

test(05): exercise default nack delay in DLQ tests

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Commits on Jun 8, 2026

Commits on Jun 26, 2026

Merge branch 'master' into nack-backoff
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