Wildfire submission logs would have a log event when a file sent to the Wildfire cloud for inspection was identified and given a verdict as Grayware file. If not enabled this log is not created and is created only for malware files. When the Report Grayware Files option is enabled, details such as session information, Behavioral summary, Network Activity, Host Activity and more that are helpful in analytics. As a best practice, we recommend having a check mark on the Report Grayware File box under WildFire general Settings in Device Setup.