messageRetentionDuration

Indicates the minimum duration to retain a message after it is published to the topic. If this field is set, messages published to the topic in the last message_retention_duration are always available to subscribers. For instance, it allows any attached subscription to seek to a timestamp that is up to message_retention_duration in the past. If this field is not set, message retention is controlled by settings on individual subscriptions. Cannot be more than 31 days or less than 10 minutes.