ENOSPC

A partner team just discovered their bulk export button and weighed it down with a coffee mug. 500 requests a second, 10 MB of uncompressed analytics payloads each. Your ingest API answers HTTP 202 to every one of them and drops them on the events queue. The queue swallows the difference, right up until the disk fills and the broker stops taking writes. The Job: Disarm the log bomb and process every request before the disk runs out.

Free to play, no account needed. A deterministic engine grades your design against this scenario's SLA - error rate, latency, and cost.