When we create Unix / Linux instances in the cloud (regardless of the provider we usually use), we are asked to use a public / private key set to secure access to the instances. Without this additional protection and only relying on a Login / Password, our systems are vulnerable to dictionary attack...
ASHRAE is one of the main players when we talk about standars definito, their guides around power supply desing in the Datacenter are a must read.
The ANSI/ASHRAE Standard 90.4-2019, Energy Standard for Data Centers is one of the most important guides to follow if you want to achieve high rates...