According to Update on Amazon Linux AMI end-of-life:
The end-of-life for Amazon Linux AMI is now extended to December 31, 2020: until then, we will continue to provide security updates and refreshed versions of packages as needed.
Beyond December 31, 2020, the Amazon Linux AMI will enter a new maintenance support period that extends to June 30, 2023.
During this maintenance support period:
- The Amazon Linux AMI will only receive critical and important security updates for a reduced set of packages.
- It will no longer be guaranteed to support new EC2 platform capabilities, or new AWS features.
Taking that into account the new deployments of Bitbucket Data Center should be done with the Amazon Linux 2 so that the new Bitbucket AMI used in Cloud formation templates should be built on it.