Lukasz DlugajczykNotes on Python, AI and building software.https://lukaszdlugajczyk.com/"Sent" is not the same as "delivered". Delivery guarantees in NATShttps://lukaszdlugajczyk.com/posts/nats-delivery-guarantees-part-1/https://lukaszdlugajczyk.com/posts/nats-delivery-guarantees-part-1/Part 1 of a series on NATS. Core NATS loses messages silently, JetStream delivers them more than once, and neither is a bug. What each guarantee costs, shown with runnable Python demos.Mon, 21 Sep 2026 10:00:00 GMT