* https://github.com/vozlt/nginx-module-vts
* https://serversforhackers.com/c/compiling-third-party-modules-into-nginx
* https://askubuntu.com/a/40050
* https://www.cambus.net/log-rotation-directly-within-nginx-configuration-file/

**nginx.conf**
```
http {
  vhost_traffic_status_zone;
  vhost_traffic_status_dump /var/log/nginx/vts.db;
}
```

**vhost.conf**
```
server {
  if ($time_iso8601 ~ "^(\d{4})-(\d{2})-(\d{2})") {
    set $year $1;
    set $month $2;
    set $day $3;
  }

  vhost_traffic_status_filter_by_set_key $year year::$server_name;
  vhost_traffic_status_filter_by_set_key $year-$month month::$server_name;
  vhost_traffic_status_filter_by_set_key $year-$month-$day day::$server_name;

  location /nginx-status {
    vhost_traffic_status_bypass_limit on;
    vhost_traffic_status_bypass_stats on;
    vhost_traffic_status_display;
    vhost_traffic_status_display_format html;
    allow 127.0.0.1;
    deny all;
  }
}
```