{"id":"pubsub-message-requires-data-or-attribute","text":"A Pub/Sub message must contain at least one of: non-empty data, ordering key, or attributes — all are not required simultaneously.","truth_value":"IN","source":"entries/2026/03/10/pubsub-publisher.md","source_url":"","source_hash":"a526c8035db6642f","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"pubsub-message-requires-data-or-attribute","truth_value":"IN","reason":"premise"}]}}