For more details, review the 18.104.22.168.1 release notes.
You can also review the Differences Between Essbase Deployment Options in order to decide on the right deployment option that suits your need. For customers that are moving from on-premise 11g to OCI review the Differences Between Essbase 11g and Essbase 21c.
Note for customers that are running Essbase 19c on OCI, deployed using the 19c Marketplace listings. Kindly review the published Oracle Support Document 2754635.1 for details on support and error correction policies for Essbase 19c running on OCI. It is recommended that customers move to the latest 21c listing to be current on support.