[threeseed]

> It looks to me if any of the VIS, CAS, LGS, or VES go down,

But the whole point is that by splitting it into micro-services you can efficiently and optimally scale each component individually. So it's extremely rare that VIS for example would entirely go down. And because Netflix has tools like Hystrix if one instance is unavailable it will seamlessly route to another one.

And Even if you push bad code there are techniques like blue/green and canary releases which can be used.