nginx vhost logging

   log_format vhost_extra '$host $remote_addr - $remote_user [$time_local] '
                           '"$request" $status $body_bytes_sent '
                           '"$http_referer" "$http_user_agent"'
                           ' rt=$request_time uct="$upstream_connect_time" uht="$upstream_header_time" urt="$upstream_response_time"';

   access_log /var/log/nginx/access.log vhost_extra;