MB
Thanks, glad it resonated! You're right that idempotency is exactly where Pub/Sub's at-least-once delivery bites people, so it's front and center in Day 2. I'm planning to cover deduplication keys on the consumer (carrying a stable event ID through the envelope and tracking processed IDs) alongside the dead-letter topic setup. Curious whether you've leaned more on broker-side dedup or handled it in the application layer — always interested in what's held up in production.