billingMode

You can't change the billing mode from EXTENDABLE_RETENTION_PRICING to FIXED_RETENTION_PRICING. If BillingMode is set to EXTENDABLE_RETENTION_PRICING and you want to use FIXED_RETENTION_PRICING instead, you'll need to stop ingestion on the event data store and create a new event data store that uses FIXED_RETENTION_PRICING.

The billing mode for the event data store determines the cost for ingesting events and the default and maximum retention period for the event data store.

The following are the possible values:

• EXTENDABLE_RETENTION_PRICING - This billing mode is generally recommended if you want a flexible retention period of up to 3653 days (about 10 years). The default retention period for this billing mode is 366 days.

• FIXED_RETENTION_PRICING - This billing mode is recommended if you expect to ingest more than 25 TB of event data per month and need a retention period of up to 2557 days (about 7 years). The default retention period for this billing mode is 2557 days.

For more information about CloudTrail pricing, see CloudTrail Pricing and Managing CloudTrail Lake costs.