How do I setup "old fashioned webhosting" to respond at-least-once to events posted to a message queue? How do I get "old fashioned webhosting" to automaticall

How do I setup "old fashioned webhosting" to respond at-least-once to events posted to a message queue? How do I get "old fashioned webhosting" to automatically scale-out and scale-in? How do I do all that and get per-100ms CPU-time billing?