feat: add HPA controller for workload deployments - #203
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@savme can we add a chainsaw end to end test to validate this behavior? I think for this we can just validate that the HPA is lifecycle correctly based on auto-scale settings.
Longer-term we need to think about how we can validate auto-scaling behavior in CI so we can confirm that custom metrics we export for instances can trigger auto-scaling.
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This PR adds the cell-local autoscaling controller for
WorkloadDeployment.When a
WorkloadDeploymenthas autoscaling enabled, the controller creates and keeps a matching HPA up to date. The HPA stays local to the cell and is not propagated through karmada. This uses the existing CPU and memory metric settings for configuration.Note that
Resourcemetrics still need to be served for pods created by kraftlet. This will be added in a follow-up.Related to datum-cloud/enhancements#799