A sample of non-blocking retries and dead letter topics (aka reliable reprocessing and dead letter queues) with Apache Kafka using Spring Boot and Spring Kafka.

📹 Replay messages from (RabbitMQ) AMQP dead-letter queue

High-performance Redis Streams queue for Node.js with Lua-powered bulk XADD, idempotent workers, heartbeat locks, stuck-task recovery, retries, DLQ, and distributed processing.

A verified .NET 8 reference for DB↔messaging reliability boundaries — transactional outbox, idempotent inbox, SKIP LOCKED multi-worker safety, dead-letter reprocessing — with a deterministic stale-failure write-race case study.

dotnet tool for managing dead letters in Azure Service Bus

Framework for building pipeline data flows

Reliable Shopify webhook ingestion starter for n8n and Supabase: HMAC, raw event storage, deduplication, queue, retry, dead-letter replay, and monitoring.

Terraform module which creates a lambda function, monitoring via CloudWatch and a dead-letter queue with roles

The framework-less BabelQueue runtime for plain PHP — a polyglot queue worker with URN routing, retries/back-off, dead-letter handling and PDO/Redis/RabbitMQ transports.

🚌 Persistent event bus with at-least-once delivery via SQLite + Redis, Fully typed.

Serverless notification system built with Python on AWS Lambda. Sends alerts via Email (SES) and Slack via HTTP webhooks and automatic retry logic and a Dead Letter Queue for fault tolerance.

RabbitMQ Dead-Letter Explained

Self-hosted, embeddable, Standard Webhooks-compliant outbound-webhooks control plane — a Svix alternative as a library.

Idempotent webhook to BullMQ worker pipeline.

The SIEM log-streaming delivery engine for Laravel — a durable transactional outbox, queued batched delivery with retry/backoff/dead-letter/circuit-breaker, SSRF-guarded HTTP egress, encrypted destination secrets, and PII redaction, on top of the framework-agnostic cboxdk/siem core.

Spring Boot starter for privacy-safe JSON masking, log sanitization, audit trails, dead-letter management, and signed webhook/email alerting.

Audit webhook dead-letter docs for DLQ behavior, failure criteria, retries, failed records, replay, idempotency, retention, privacy, signatures, ordering, and alerts.

Exactly-once processing for webhooks, events, and jobs. Dedupe, crash recovery, and dead-letter handling in one call.

Production-oriented webhook processing reference built with TypeScript, NestJS, PostgreSQL, Prisma, durable jobs, retries, idempotency and replay.