messaging
At-Most-Once Delivery
Fire and forget — messages may be lost but are never duplicated. Zero retries.
Total Sent0
Delivered0
Lost0
Delivery Rate—%
Duplicates0 (guaranteed)
Loss Rate
// message stream (recent 30)
No messages sent yet
✓ Guarantee
No duplicate processing — each message delivered at most once. Consumer logic stays simple.
✗ Risk
Messages can be permanently lost. No retry mechanism. Acceptable only for non-critical data.
// event log
No events yet.
// how it works
- Send message once — never retry
- If network drops it, it's permanently gone
- Consumer never sees duplicates
- Fastest delivery semantics (no ACK wait)
// use cases
- Metrics/telemetry (losing some is OK)
- Real-time gaming (stale data is useless)
- UDP-based protocols, log shipping
- Never use for financial transactions