What must be in a server rack?

Question

Data center

Hello everyone, what should be in a server rack?
Well, of course
Rack
Router
Switch
UPS
Something else?

Answer 1

Very much depends on requirements (the customer or to certification). For example, it can be:
1. a network-controlled socket block
2. equipment that performs ip-kvm/kvm/out-of-band management functionality
3. temperature and humidity sensors by zones, smoke, opening of rack doors
4. external critical/major alarm /minor/warning (quite optional)
5. rack hood (usually a fan unit installed instead of a cover if the rack air conditioning is not vertical and there is no raised floor in the data center)
6. security cameras
7. antistatic wristbands
ps Perfectionist data center architects read in the morning TIA-942 and TIA-606-A standards

Answer 2

Only the servers and the rack itself are obligatory, and the sockets are probably (better controlled, although I, having such ones - I have never used them - I was lucky) everything else is optional and depends on what is outside the rack.