>> We don't want to give full acces to the developers. But if we can give a read-only access to the GLUU console, they will can confirme by them selves, an issu with their apps.
But if you want anyone to 'access' the oxTrust of Gluu Server ( the GUI where configurations are stated ); there are just two types of users; first: 'Gluu Manager Group' and second: general user who doesn't have access to any admin feature.
If you want them to 'SSH' into the Gluu Server box; without being 'root' it's not possible to login into 'Gluu Server container'.
I think the best option for you would be to ask them what they want to see and provide that info from your / some other admin account; at least I would do that.