Service 'MySQL5Plus' displays as inactive in CP, though the service is working OK.
Software issue #POA-109640. The state controller is missing is package, thus current service status cannot be checked.
Despite that the service is working stable and can be used in production.
The fix is planned to be included in one of the future product updates.
Contact your Technical Account Manager or PTA team (firstname.lastname@example.org) to check the status of #POA-109640.