Database Compatability Level
This warning indicates that the database is not running with the latest compatibility level that the SQL Server version supports.
For example, this could mean the database is using compatibility level 110 (SQL Server 2012), but the instance is SQL Server is 2019. Using lower compatibility levels may be a requirement, but if not, there could be enhanced or new features that your systems could be using.
Databases should use the latest compatibility level if supported.
Any suggestion from Aireforge should be thoroughly tested before being implemented into production.