Enum specifying the severity of the issue.

SEVERITY_UNSPECIFIED Default value. Will never be provided by the API.
ERROR Causes either an account suspension or an item disapproval. Errors should be resolved as soon as possible to ensure items are eligible to appear in results again.
WARNING Warnings can negatively impact the performance of ads and can lead to item or account suspensions in the future unless the issue is resolved.
INFO Infos are suggested optimizations to increase data quality. Resolving these issues is recommended, but not required.