ffdo-ansible/roles/service-node_exporter/templates/node_exporter_nginx.j2

location /metrics {
  if ($http_authorization != 'Bearer {{ node_exporter_authorization_token }}') {
    return 403;
  }
  proxy_http_version      1.1;
  proxy_set_header        Host $host;
  proxy_set_header        X-Real-IP $remote_addr;
  proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header        X-Forwarded-Proto $scheme;

  proxy_pass              http://localhost:9100;
  proxy_redirect          off;
}