In SGOS version 6.6.3.x, we can enable Intelligence Services and use the Application Classification feature.
However, when you try to enable Application Attributes, a Critical Health Check Alert is presented, per the image below;
Even there is options to enable this on the Management Console and command line, this feature is not to be enabled as instructed by the 66x Release Notes.
"In this release, the Management Console, policy, and the command line include references to Application Attributes; however, you cannot enable the service or install related policy. This feature is unavailable until further notice."
There is no resolution at this time. Please review future releases for more information on the availability of this feature.