Customize metrics and support scale to zero functionality

[testwhygh]

Ask your question here:

Hello, in knative doc, it says KPA supports scale to zero functionality, does not support CPU-based autoscaling. And HPA does not support scale to zero functionality, but supports CPU-based autoscaling.
If I want to customize metrics such as cpu-based autoscaling while maintaining the ability to scale to 0, what should I do ?
Thanks.

[skonto]

Hi @testwhygh pls take a look at autoscaler-keda, still Alpha status though. HPA does not scale from/to zero, KEDA does offer that for custom metrics.

[testwhygh]

Hi @testwhygh pls take a look at autoscaler-keda, still Alpha status though. HPA does not scale from/to zero, KEDA does offer that for custom metrics.

Amazing, your extension integrates KEDA into Knative. Because KEDA can scale to 0 and supports customize metrics, after using this extension, Knative also has the above capabilities. Is that right?

[testwhygh]

Hi @testwhygh pls take a look at autoscaler-keda, still Alpha status though. HPA does not scale from/to zero, KEDA does offer that for custom metrics.

We have deploy Keda in our cluster and found that controlling deployments by KPA and KEDA at the same time will cause conflicts. Does this extension replace KPA/HPA with KEDA?

[skonto]

This extension is meant to replace the hpa autoscaler only. The custom metrics support in Serving for KPA was abandoned years ago due to no demand back then.