o11y: add Prometheus metric for scaledObject condition array

[erikkn]

Proposal

The scaledObject object has a condition attribute that shows an array of conditions the object has passed through. An example:

status:
  conditions:
  - message: ScaledObject is defined correctly and is ready for scaling
    reason: ScaledObjectReady
    status: "True"
    type: Ready
  - message: Scaling is performed because triggers are active
    reason: ScalerActive
    status: "True"
    type: Active
  - message: No fallbacks are active on this scaled object
    reason: NoFallbackFound
    status: "False"
    type: Fallback

I would like to add a Prometheus metric for this which in the core is very similar to the HPA condition metric kube_horizontalpodautoscaler_status_condition (here).

What do you guys think? I am happy to pick this one up when it receives positive feedback from the community.

Use-Case

Show health of scaledObjects and alerting

Anything else?

No response

[tomkerkhove]

That's OK for me, @zroubalik @JorTurFer?

[JorTurFer]

Agree

[zroubalik]

I like this idea as well.

[tomkerkhove]

Let's do it @erikkn! Thanks for picking it up.