retentionPeriod

The retention period of the event data store, in days. If BillingMode is set to EXTENDABLE_RETENTION_PRICING, you can set a retention period of up to 3653 days, the equivalent of 10 years. If BillingMode is set to FIXED_RETENTION_PRICING, you can set a retention period of up to 2557 days, the equivalent of seven years.

CloudTrail Lake determines whether to retain an event by checking if the eventTime of the event is within the specified retention period. For example, if you set a retention period of 90 days, CloudTrail will remove events when the eventTime is older than 90 days.

If you decrease the retention period of an event data store, CloudTrail will remove any events with an eventTime older than the new retention period. For example, if the previous retention period was 365 days and you decrease it to 100 days, CloudTrail will remove events with an eventTime older than 100 days.