How to Ensure Zero Down Time?

Almost all companies have different types of softer delivery. We call it a artfix service pack, or future bearing releases and what not. Ort fixes are the critical things that need to go in at some point as close to the incident as possible. There are good techniques to achieve zero down time. But the softer has to be designed in a way that allows for that right? Do you have a bundle bill which contains all the contain together, or do you deploy each container separately? And then what about if you have schemer changes? How do you take advantage?"