# Delivery and failure

How an event reaches its subscribers, what happens when a subscriber fails, and what the person running the app sees.

| Page | What it covers |
|---|---|
| [Delivery: at least once, safe to repeat](/docs/delivery-at-least-once-safe-to-repeat.md) | Every committed event reaches each of its subscribers at least once. |
| [Retries and giving up](/docs/retries-and-giving-up.md) | When a subscriber's action fails, Jadpo decides whether to try again from the way it failed. |
| [Several changing calls in one action](/docs/several-changing-calls-in-one-action.md) | Some jobs take several calls that each change something at a provider. |
| [What an operator sees](/docs/what-an-operator-sees.md) | Background work that goes wrong waits for a person rather than disappearing. |
| [Limits and runtime faults](/docs/limits-and-runtime-faults.md) | These limits may change once they have been measured on real runs. |