# File lib/rudy/metadata.rb, line 201
201:     def descriptors(*additional)
202:       criteria = {
203:         :region => @region,  :zone => @zone,
204:         :environment => @environment, :role => @role
205:       }
206:       additional.each do |att|
207:         criteria[att] = self.send(att)
208:       end
209:       ld "DESCRIPTORS: #{criteria.inspect} (#{additional})"
210:       criteria
211:     end