Allow Cluster API node groups to scale to and from zero

[mkjpryor]

Which component are you using?:

cluster-autoscaler

Is your feature request designed to solve a problem? If so describe the problem this feature should solve.:

I have a Cluster API cluster with some general purpose nodes and some specialist, expensive nodes that is used for batch-type workloads. I would like to be able to scale the specialist nodes down to zero unless a workload needs them.

Describe the solution you'd like.:

For the cluster autoscaler to be able to scale Cluster API machine deployments to and from zero nodes.

Describe any alternative solutions you've considered.:

None - the cluster autoscaler works perfectly for everything except this.

Additional context.:

N/A

[elmiko]

this appears to be a duplicate of #3150

/close

[k8s-ci-robot]

@elmiko: Closing this issue.

In response to this:

this appears to be a duplicate of #3150

/close

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