https://www.drupal.org/node/425990 →
Using a load balancer or reverse proxy →
needs to be migrated to the new documentation system.
Note that's a tricky part of a "professional" installation with lot of consequences, so it should not be buried to deep in the documentation.
Review https://www.drupal.org/docs/getting-started/installing-drupal/using-a-lo... → , place it in the correct section, and delete the old page.
Needs review
Placement/Navigation/Structure