[birdayz]

that's just not true. NATS does have neither at-least-once nor exactly-once. NATS Jetstream has at-least-once, but it does not have flexible topics anymore like NATS. It's two completely different things.

[coffeeri]

I was including NATS Jetstream, which has exactly-once message delivery [0].

[0] https://docs.nats.io/nats-concepts/jetstream#exactly-once-me...

[bruth]

You may be thinking of NATS Streaming which was a predecessor to JetStream. It was indeed a standalone thing that used NATS under the hood. JetStream is now baked into the NATS server.