For execution packages there should be a WarningStep with possibility to get Mail, In many cases when you are having issues with connections to source data, you need to use ex continue with existing data.
In those cases the success message contains info about the warning. But we should not be relying on external systems to filter and monitor success messages for Warnings, to get notification about these events. So I suggest a WarningStep.
A step when the Execution package has been able to be completed, but it contains warnings.