[SYMBOL] [A] [B] [C] [D] [E] [F] [G] [H] [I] [K] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [Z] latency 2nd layers 2nd application 2nd 3rd 4th 5th data flexibility information infrastructure 2nd 3rd 4th instrumentation interface management observability operating system services storage abstraction licensing additional costs constraints provisioning tools life cycle 2nd mobility promotion limitations build inefficiencies physical load balancers 2nd 3rd 4th 5th 6th 7th 8th 9th local distributors logging logic unit number |