This is a fork of kubernetes/autoscaler developed for the gardener/machine-controller-manager and gardener/gardener project.

Rationale behind the fork

gardener project uses gardener/machine-controller-manager to manage machines for clusters deployed using gardener. The scaling of machines is then to be supported by an autoscaler that talks to machine-controller-manager to scale the machines attached to a cluster. For this we have forked the kubernetes/autoscaler and have implemented a new cloud provider interface to support the machine-controller-manager.

• kubernetes/autoscaler has a long term plan for supporting machine APIs (https://github.com/kubernetes/kube-deploy/blob/master/cluster-api/pkg/apis/cluster/v1alpha1/machine_types.go) to support scaling of machines in a cluster.

• gardener/machine-controller-manager is meant to align with these machine APIs in future.

• Keeping the above in mind, the short term solution is to have a customized fork of autoscaler to support the machine-controller-manager in order to support the current requirements for Gardener and mitigate to the original cluster autoscaler as soon as both autoscaler and machine-controller-manager have aligned with machine APIs.