    # File lib/fog/rackspace/requests/compute_v2/set_metadata_item.rb, line 5
            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