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# Messaging family — first release

## Added

| Document | What it carries |
|---|---|
| `reference/messaging/pubsub.md` | four objects, five subscription types, at-least-once by default, ordering keys, dead-letter topics |
| `reference/messaging/cloud-tasks.md` | queue-as-policy, two target types, the three controls, and when to choose it over Pub/Sub |
| `reference/messaging/eventarc.md` | CloudEvents, the Cloud Audit Logs source, the destinations, Standard against Advanced |
| `reference/messaging/errors.md` | the six failures that are usually a contract misunderstanding |
| `guides/messaging/deliver-pubsub-to-cloud-run.md` | six steps, ending in a deliberate failure test |
| `guides/parity/messaging.md` | the one-to-three mapping, the partition question, and the consumers Pub/Sub deletes |

## The headline facts

1. **Three Pub/Sub subscription types write into BigQuery, Bigtable or Cloud Storage with no code.** Finding
   the equivalent consumer in a source architecture and deleting it is the most commonly missed saving in a
   messaging migration.
2. **Microsoft's own table maps Pub/Sub to three Azure services.** That is the family's whole shape: one
   Google Cloud product against two or three elsewhere.

## Absences and hedges recorded rather than filled in

- The Pub/Sub overview states **no default message retention**, so none is quoted; the error catalogue says to
  read it from the subscription.
- **Pub/Sub Lite** is referenced only as a separate documentation set. Nothing about its status is claimed.
- The Cloud Tasks overview **does not compare itself to Pub/Sub**; the choose-between rule in
  `reference/messaging/cloud-tasks.md` §4 is labelled as the hub's reading.

## Known missing

- Cloud Scheduler and Workflows, both named in the parity table and not documented.
- Pub/Sub schema evolution, snapshots and seek (replay).
- Subscription filtering.
- Service-to-service authentication details for push endpoints beyond the invoker role.
- Eventarc Advanced pipeline configuration.


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