The MariaDB project is as active as the community around it and the MariaDB Foundation members actively working on and enhancing MariaDB. Therefore, from the MariaDB project perspective, the aspiration is for each major version of MariaDB to be maintained for quite a while after its initial stable (GA) version. For specific dates related to each version and more details, see the MariaDB Deprecation Policy. You may also want to review the MariaDB Corporation Engineering Policies.
Additional Technical Support
MariaDB Corporation can of course offer additional Technical Support and Services to their customers that cover the versions even longer and provide SLA commitments for additional feeds. Please contact us for more details.