Current behaviour

When performing an upgrade from 2.11 to 2.12 the Supported Configuration page states that only MySQL 8 is supported when using external databases. There is no possibility to remain in a supported configuration when performing the upgrade due to this limitation and in the event of a failed upgrade the unsupported configuration may not be able to be rolled back.

In summary, upgrading from 2.11 to 2.12, when using external database, we'll fall in the following two scenarios:

• Upgrading the 3scale first (2.11 > 2.12) with MySql 5.7 - Unsupported Config.
• Upgrading the MySQL first (5.7 > 8) with 3scale 2.11 - Unsupported Config.

Expected behaviour

When MySQL is used as an external database for system then both versions 5.7 and 8 are supported to facilitate the upgrade procedure and provide some safety in the event of a failed upgrade of 3scale the external database might now be "stuck" on MySQL 5.7 until a successful of 3scale can be complete.