class role::gerrit {

        system_role { "role::gerrit": description => "Gerrit installation" }

        class labs {
                system_role { "role::gerrit::production": description => "Gerrit in labs!" }

                gerrit::instance { "gerrit-dev.wmflabs.org":
                        ircbot => false,
                        db_host => "gerrit-db"
                }

        class { "gerrit::jetty": instance => Gerrit::Instance["gerrit-dev.wmflabs.org"] }
        }