Comment 30 for bug 1460222

I don't think I'd want to use labels for that use case. That's stuff that deserves to be properly reflected as port attributes.

I still think labels make sense as end user defined metadata. Otherwise, for things that backends are expected to actually interpret, I think they should be well defined attributes. That provides an opportunity to review what other use cases it might satisfy and find a definition that can apply to more than one use case and backend.