map $status $omitOKs {
  default 1;
  ~^[2][0][0] 0;
}

server {
    listen 8080;
    error_log stderr;
    access_log /dev/stdout {{{ logFormat }}} if=$omitOKs;
    location /metrics {
        vhost_traffic_status_display;
        vhost_traffic_status_display_format prometheus;
    }
}