The setup:

2 or more nginx machines
each machine has the same virtual hosts
traffic is load balanced via DNS to each machine

I need to figure out what are the best tools to use to get some traffic stats, mostly interested in amount of hits and total traffic in gigabytes. Obviously, the log information will come from nginx, formatted like this:

  log_format  main  '$remote_addr $host $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" "$http_user_agent" "$gzip_ratio"';