Behavior wrt min/max limits is not publicly documented

[Shnatsel]

Cluster autoscaler FAQ does not describe how CA handles min/max limits.

People often expect min/max to be enforced by CA, and that changing the minimum number of nodes alone will trigger a scale-up (example). The actual behavior is that CA does not enforce these limits, so if someone manually resizes the cluster beyond those limits, CA will not intervene.

Since this is a common cause of misunderstanding, we need some public documentation on the expected behavior.

[MaciekPytel]

You're 100% right, this should be documented. Do you want to take a shot at writing it up?

[Shnatsel]

Sure. I'll open a PR to get the ball rolling, and check "allow edits from maintainers" so that you can correct anything I got wrong.

[Jeffwan]

I have an issue related here. #1559

Auto-Discovery is preferred and min/max does brings confusion. I didn't come up good solutions on code side, documentation will be helpful.