Almost 5 years ago I've started working on DRD - a.k.a. Drupal Remote Dashboard. The idea behind this module which is published on drupal.org has been and still is to provide a central place in a web browser for Drupal shops and system administrators or DevOps to get all the essential data and statuses about any number of Drupal installations.
Although so many articles have been written about this issue already, the approach I'm using successfully hasn't been mentioned yet - or I missed the appropriate post. Hence I'm writing another one and hope people may find this useful.