This repo hosts the provider-agnostic core logic for Kubernetes Cluster Autoscaler, including the cluster snapshot, scale-up/down decision logic, and external/test provider implementations.

Cluster Autoscaler originally started out in the kubernetes/autoscaler repo, with provider-agnostic core logic combined with provider-specific logic. That original repo keeps hosting the provider-specific logic, and imports the core CA logic from here to form a complete Cluster Autoscaler component.

The core Cluster Autoscaler logic in this repo is essentially a framework - it determines the overall code flow, and exposes code hooks that allow injecting custom logic in certain parts of the flow (in particular provider-specific logic).

The eventual goal is for the core CA logic in this repo to form a proper library, exposing only the "building blocks" - without dictating how the code flows between them. This change is expected to take significant time, and can be tracked in kubernetes/autoscaler#9264.

WARNING: parts of this repo are still WIP

This repo is still in the last steps of being split away from the kubernetes/autoscaler repo.

Most of the files/directories have already been split and are in the correct repo, but some are temporarily duplicated between the 2 repos. If you want to modify any of the following paths, you must do so in the other repo - the files here are just mirrors:

• pkg/apis
• pkg/cloudprovider/azure
• pkg/cloudprovider/gce
• pkg/proposals and other files containing documentation

The structure of the files in the repo is still being worked on as well - in particular pkg/ still contains a bunch of non-Go files. These will be moved to other places soon, the intention is for pkg/ to only contain Go code.

This state should be very temporary, the migration can be tracked in kubernetes/autoscaler#9832.

The repo is otherwise fully functional, further changes to core Cluster Autoscaler logic should happen via PRs here.

Learn how to engage with the Kubernetes community on the community page.

You can reach the maintainers of this project at:

• Slack channel
• Mailing List
• Weekly SIG Autoscaling meetings on Thursdays 17:00 CET. Joining the mailing list above should get you the invitation.

Participation in the Kubernetes community is governed by the Kubernetes Code of Conduct.