I've been out of the datacenter business for...well, not very long. But when I was there it was blade servers and mezzanine networking.

Now I see datacenters with a solid perimeter of LP generators (presumably not for backup) and Nvidia continues to churn out massively more expensive chips and the New mentions 'The biggest AI datacenters ever'

And I'm wondering: what do they look like? What underlying support software/OS/Automation is being used? (Still VMware/Proxmox or something else?)

How doe you get back up to current best practices when theses things have a certain level of 'need to know'?