Proposal

Provide similar exported metrics that the Kubernetes metrics-server has that are useful for tracking SLOs for KEDA (ex latency, or % of successful requests, ect...)

ex:

apiserver_request_total{group="external.metrics.k8s.io"}
apiserver_request_slo_duration_seconds{group="external.metrics.k8s.io"}

Use-Case

I would like to get the number of requests that have failed to keda api server; currently this isn't possible, with metrics-server, I can do something like:

(
  sum(rate(apiserver_request_total{group="metrics.k8s.io", code=~"(5..|429)"}[5m])) +
  sum(rate(apiserver_request_terminations_total{group="metrics.k8s.io"}[5m]))
)

This is because apiserver_request_total{group="metrics.k8s.io"} is exposed by the metrics-server and metrics-server uses the apiserver package from kubernetes

KEDA could expose similar metrics either by using the apiserver package from Kubernetes or implementing something similar;

Is this a feature you are interested in implementing yourself?

Yes

Anything else?

the aggregation api from kubernetes tracks failed requests to external.metrics.k8s.io via apiserver_request_terminations_total ; it does not track the total # of requests though; There's currently no way to get the total # of requests to external.metrics.k8s.io since the keda metrics apiserver doesn't expose this information;