# File lib/fog/rackspace/requests/compute_v2/set_metadata_item.rb, line 18
        def set_metadata_item(collection, obj_id, key, value)
          request(
            :expects => 200,
            :method => 'PUT',
            :path => "#{collection}/#{obj_id}/metadata/#{key}",
            :body => Fog::JSON.encode('meta' => { key => value })
          )
        end