Comment 3 for bug 897460

You can try using the origin pattern for this, e.g.:

Unattended-Upgrade::Origins-Pattern {
        "origin=Google\, Inc.,suite=contrib";
        "site=www.example.com,component=main";
 };

(see the README in the package for more information).

I will set to "need-info" to see if that works, if there is something missing to make it work, please
add what it is and reopen the bug.

Thanks,
 Michael