End of Support for Legacy Reports
Starting 2022, Metric Insights will no longer support Legacy Reports. Legacy Report is a type of Report that users could create directly from any Data Source, while "new" MI Reports (aka Dataset Reports) can be built only from Dataset previously created in the system.
Compared to Dataset Reports, Legacy Reports lack robustness and their Editors offer limited usability. Another reason for stopping support for Legacy Reports is the future upgrade from Python 2.7.
In case Legacy Reports are still essential for your organization, they need to be migrated to Dataset Reports.