Covers functions and managed compute where the platform enforces statelessness and bills per request — cold starts, event-driven design, concurrency limits, and when serverless does not fit. Use this whenever the user is writing a Lambda/Cloud Function/Azure Function, designing an event-driven pipeline, debugging cold-start latency, hitting concurrency throttling, or asking whether to move a workload to serverless. For managed-vs-self-run tradeoffs use `cloud-architecture`; for containers use `kubernetes-operations`; for scheduled batch use `scheduled-jobs`.
