Introduction
When you run apps on Google Kubernetes Engine, you need groups of machines called node pools. Auto scaling helps these groups grow or shrink automatically based on how busy your app is. This saves money and keeps your app running smoothly.
When your app traffic changes a lot during the day and you want to save costs by using fewer machines when traffic is low.
When you want to add different types of machines for special tasks, like some with more memory or CPUs.
When you want Google Cloud to automatically add or remove machines so your app stays fast without manual work.
When you want to test how your app behaves with different numbers of machines.
When you want to keep your app available even if some machines fail by having extra machines ready.