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Compact messaging system with port-based component connections

Dynamic worker pool management with load balancing, auto-scaling, and health monitoring

Async API request handling with callbacks, webhooks, and error recovery mechanisms

SDL diagram for message queue processing system with ACK/NACK handling and dead letter queue management

Queue-based asynchronous processing with horizontally scaled workers. Starter template grounded in the Queue and Worker Pool D2 syntax pattern.

Queue-based asynchronous processing with horizontally scaled workers. Operations variant that adds scheduled ingestion and dead-letter replay controls.

Queue-based asynchronous processing with horizontally scaled workers. Enterprise variant that adds capacity metrics and upstream throttling alerts.

Asynchronous callback lifecycle from acceptance to completion fetch. Starter template grounded in the Async Callback Flow D2 syntax pattern.

Asynchronous callback lifecycle from acceptance to completion fetch. Operations variant that adds webhook registration and signature verification flow.

Asynchronous callback lifecycle from acceptance to completion fetch. Enterprise variant that adds cancellation and restart paths for long-running jobs.