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.

dotnet tool for managing dead letters in Azure Service Bus

Framework for building pipeline data flows

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.

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

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

Idempotent webhook to BullMQ worker pipeline.

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

RabbitMQ Dead-Letter Explained

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.