[FatalBaboon]

Ansible Tower lets you execute a playbook via a web GUI, and keeps a log of who executed what.

I'm not sure if it also shows some infrastructure graphs, but I'm talking about knowing if links are up, how they are firewalled, where the config for each thing is, etc.

When you host tens of services on hundreds of machines, this information is hard to get a grasp on, no matter what you do or how well you documented everything, because it takes a while to read through it.