Monitoring CRD via kube-state-metrics

[oalimerko]

In my AKS setup I'm using some CRD like this:

apiVersion: businessconfig.oa-software.com/v1
kind: BusinessConfigDefinition
metadata:
  annotations:
    meta.helm.sh/release-name: myapp
    meta.helm.sh/release-namespace: dev
  creationTimestamp: '2024-11-01T11:25:31Z'
  generation: 3
  labels:
    app.kubernetes.io/managed-by: Helm
    helm.toolkit.fluxcd.io/name: myapp
    helm.toolkit.fluxcd.io/namespace: dev
  name: processors
  namespace: dev
  resourceVersion: '116531627'
  uid: 65bad12b-4921-4876-968f-513714b533db
  selfLink: >-
    /apis/businessconfig.oa-software.com/v1/namespaces/dev/businessconfigdefinitions/processors
status:
  message: ''
  state: SUCCESS

My goal is to monitor the state of CRD (SUCCESS or ERROR),collecting some metrics and push them to prometheus.I already configured kube-state-metrics like below:

      containers:
        - name: kube-state-metrics
          image: registry.k8s.io/kube-state-metrics/kube-state-metrics:v2.14.0
          args:
            - '--port=8080'
            - >-
              --resources=certificatesigningrequests,configmaps,cronjobs,daemonsets,deployments,endpoints,horizontalpodautoscalers,ingresses,jobs,leases,limitranges,mutatingwebhookconfigurations,namespaces,networkpolicies,nodes,persistentvolumeclaims,persistentvolumes,poddisruptionbudgets,pods,replicasets,replicationcontrollers,resourcequotas,secrets,services,statefulsets,storageclasses,validatingwebhookconfigurations,volumeattachments
            - '--metric-labels-allowlist=pods=[chart],deployments=[chart]'
            - >-
              --metric-annotations-allowlist=pods=[app.kubernetes.io/version],deployments=[app.kubernetes.io/version],statefulsets=[app.kubernetes.io/version]
            - '--custom-resource-state-config'
            - |
              kind: CustomResourceStateMetrics
              spec:
                resources:
                  - groupVersionKind:
                      group: businessconfig.oa-software.com
                      version: "v1"
                      kind: BusinessConfigDefinition
                    namespace: dev-spot-services
                    metrics:
                      - name: businessconfig_state
                        help: "State of BusinessConfigDefinition"
                        type: Gauge
                        field: status.state
                        labels:
                          state: "status.state"
                        valueMapping:
                          SUCCESS: 1  # State SUCCESS will map to 1
                          FAILURE: 0  

however I get the error:
1 discovery.go:210] "failed to update custom resource stores" err="failed to create metrics factory for businessconfig.oa-software.com_v1_BusinessConfigDefinition: businessconfig_state: compiling metric: unknown metric type "

Since status.state is a string and Gauge works only with numeric data,I don't know how to proper handle this?Any help or idea is more then welcome