You mean at the code, or here as PR comment?

Basically it's creating a Hash of unique zones from the servers array, and then filling each zone with the servers attached to it to match the AggregatedServers response. As the request can be filtered, it tries to look up for the server name if the filter is set.

The self.data[:servers] should be filled each time you insert a server (https://github.com/fog/fog/blob/master/lib/fog/google/requests/compute/insert_server.rb#L37). 

Makes this sense?