CustomResourceStateMetrics Failing to Report Value

[kevarr]

What happened:

When creating CustomResourceStateMetrics to add a metric CRD resource annotations (similar to the example doing the same for VPA), KSM isn't exposing a metric value.

# HELP kube_customresource_application_annotations Kubernetes annotations converted to Prometheus labels.
# TYPE kube_customresource_application_annotations gauge
# HELP kube_configmap_annotations Kubernetes annotations converted to Prometheus labels.

What you expected to happen:

Custom metric with value exposed via KSM.

How to reproduce it (as minimally and precisely as possible):

I'm using an ArgoCD Application CRD, but the same may be reproducible with any other CRD.

kind create cluster
helm install kube-state-metrics prometheus-community/kube-state-metrics --create-namespace -n kube-state-metrics -f defaults.yaml

Helm values I'm using..

defaults.yaml

    
    rbac:
      extraRules:
        - apiGroups:
            - "argoproj.io"
          resources:
            - "applications"
          verbs:
            - list
            - watch
    
    customResourceState:
      enabled: true
      config:
        kind: CustomResourceStateMetrics
        spec:
          resources:
            - groupVersionKind:
                group: argoproj.io
                kind: "Application"
                version: "v1alpha1"
              labelsFromPath:
                application: [metadata, name]
                namespace: [metadata, namespace]
              metrics:
                - name: "application_annotations"
                  help: "Kubernetes annotations converted to Prometheus labels."
                  each:
                    type: Gauge
                    gauge:
                      path: [metadata, annotations]
    
  

Anything else we need to know?:

Application manifest:

apiVersion: argoproj.io/v1alpha1
kind: Application
metadata:
  annotations:
    foo: bar
    test: testing
  name: guestbook
  namespace: argocd
spec:
  destination:
    namespace: default
    server: https://kubernetes.default.svc
  project: default
  source:
    path: guestbook
    repoURL: https://github.com/argoproj/argocd-example-apps.git

Thanks in advance! I'm assuming I'm missing something obvious but after staring at this for a while I'm out of ideas.

Environment:

• kube-state-metrics version: v2.14.0
• Kubernetes version (use kubectl version): v1.32.0
• Cloud provider or hardware configuration: Kind cluster
• Other info: N/A

[richabanker]

/triage accepted
/assign @rexagod