In this final article, we're going to explore Production practices 22. Events Are Delivered, Not Guaranteed A common misconception in event-driven architecture is that publishing an event guarantees it will be processed exactly once. Production systems rarely provide that guarantee.
Source: [Dev.to](https://dev.to/morpheus-vera/building-reliable-event-driven-systems-event-schemas-versioning-contract-testing-and-events-vs-47ed)