MariaDB upgrade option is missing under Tools & Settings > Database Servers

Symptoms

• The Tools & Settings > Database servers tab does not contain the option to upgrade the MariaDB service to version 11.4.
• The current MariaDB version is 10.11

Cause

The automatic upgrade feature supports the upgrade to MariaDB 11.8. The supported version is always updated. You can check the latest version at Plesk change log. 

Resolution

Refer to article: "Upgrade MariaDB" section "Plesk UI"tab.