Wikitech users include puppet class on nodes via the wikitech "configure instance" interface, in which they check boxes corresponding to the names of puppet classes.
In production, we use the role keyword to include role:: classes on certain nodes and to import hiera role scope. This role keyword is not available for users to include classes in labs.
We should make wikitech somehow role aware. Perhaps checking a box to include a class that starts with 'role::' should include via the role keyword rather than plain ol' include. Or perhaps there should be a differentiation in the interface between regular classes and role classes.
Either way, if this is done, then hiera role scope will work in labs.