Supporting HPA autoscaling/v2

[day0ops]

Version

1.12.x (latest stable)

Is your feature request related to a problem? Please describe.

HPA has been graduated to GA and we should use autoscaling/v2 for all the HPAs that we create on Kubernetes v1.23+. This has been widely blogged as well.

This means that when Gloo is deployed with its current HPA on Kubernetes v1.23+, Kubernetes API will upgrade either autoscaling/v1 or autoscaling/v2beta2 automatically to autoscaling/v2. Downside to this is there currently isn't a good set of options to configure HPA for autoscaling/v2 version.

Describe the solution you'd like

Gloo HPA configuration should include support for autoscaling/v2 and various options.

Describe alternatives you've considered

No response

Additional Context

Support matrix already includes Kubernetes 1.23 & 1.24 as supported.

[kevin-shelaga]

I could probably add this in fairly quickly, but what fields are missing right now? Metrics and behaviour are both there and available to be defined from what I can see @pseudonator

https://kubernetes.io/docs/reference/kubernetes-api/workload-resources/horizontal-pod-autoscaler-v2/#HorizontalPodAutoscalerSpec

[day0ops]

@kevin-shelaga yup both configs are supported but adding autoscaling/v2 should be suffic at this point. If you don't have any bandwidth let me know I'm happy to raise a PR for this.

In addition IMO we should add a section in this docs page about this so people are aware if they are running in 1.23+ to specify autoscaling/v2 instead.

[kevin-shelaga]

@pseudonator my mistake i misread the template, i see it currently checks for v2beta for those fields. Makes sense now.