NOTE: Product Issues are never imported automatically - you must trigger an import to view them. Additionally, Issues are stored for no more than 4 days before they are cleared from this table.
You can re-import as you see fit but know that it will clear after 4 days.
The Product Issues tab can be used to review feed diagnostics as returned by Google Merchant Center.
You can filter your columns to view select items, and you can also trigger Issue Imports as needed by clicking Import Issues