Reliability

Use this category for patterns that harden function apps against duplicate delivery, transient failure, and partial completion. These recipes focus on operational correctness more than transport choice.

Category map

flowchart LR
    Msg[Incoming message] --> Fn[Azure Function]
    Fn --> Idem{Already processed?}
    Idem -->|yes| Skip[Ack & skip]
    Idem -->|no| Work[Process]
    Work -->|transient failure| Retry[Retry / dead-letter]

Recipe	Trigger	Difficulty
Retry and Idempotency	Cross-trigger reliability pattern	Intermediate
Circuit Breaker	HTTP + state management	Advanced
Poison Message Handling	Queue / Service Bus DLQ	Intermediate
Outbox Pattern	DB + Queue transactional	Advanced
Rate Limiting Throttle	HTTP + Redis/state	Intermediate