All data sources have been removed.
Why is there a data source from System that I can't delete?
The Audit app cannot be empty.
When all data in Audit is removed, the system creates a data source with test data to keep Audit functioning.
Once a System Administrator creates another data source that has successfully parsed data, the system data source is removed.
Take caution when deleting a data source.
The previously collected data cannot be recovered without creating another data source that contains that same data.
Additional reference:
https://techdocs.broadcom.com/us/en/symantec-security-software/information-security/symantec-cloudsoc/cloud/audit-home/data-source-management/deleting-a-data-source.html