CustomResourceStateMetrics: Info metrics for array of a CR

[adberger]

Hi there

We are using capsule for tenancy.
The CRs of capsule look like the following:

- apiVersion: capsule.clastix.io/v1beta2
  kind: Tenant
  metadata:
    creationTimestamp: "2023-08-14T14:29:48Z"
    generation: 1
    name: oil
    resourceVersion: "776629"
    uid: 1ce4c499-b229-4f4c-b20c-8873b698b491
  spec:
    owners:
    - clusterRoles:
      - admin
      - capsule-namespace-deleter
      kind: User
      name: alice
    - clusterRoles:
      - admin
      - capsule-namespace-deleter
      kind: ServiceAccount
      name: system:serviceaccount:tenants:oil
  status:
    namespaces:
    - oil-foo
    - oil-grafana
    size: 2
    state: Active
kind: List
metadata:
  resourceVersion: ""
  selfLink: ""

I've successfully extracted the size and the state of the CRs with the following configuration:

                  - name: "tenant_size"
                    help: "Count of namespaces in the tenant"
                    each:
                      type: Gauge
                      gauge:
                        path: [status, size]
                    commonLabels:
                      custom_metric: "yes"
                    labelsFromPath:
                      capsule_tenant: [metadata, name]
                      kind: [ kind ]
                  - name: "tenant_state"
                    help: "The operational state of the Tenant"
                    each:
                      type: StateSet
                      stateSet:
                        labelName: state
                        path: [status, state]
                        list: [Active, Cordoned]
                    commonLabels:
                      custom_metric: "yes"
                    labelsFromPath:
                      capsule_tenant: [metadata, name]
                      kind: [ kind ]

I'm now struggling to get the namespaces of a tenant as multiple metrics.
I've tried the following:

                  - name: "tenant_namespaces_info"
                    help: "Namespaces of a Tenant"
                    each:
                      type: Info
                      info:
                        path: [status, namespaces]
                        labelsFromPath:
                          tenant_namespace: [value]
                    commonLabels:
                      custom_metric: "yes"
                    labelsFromPath:
                      capsule_tenant: [metadata, name]
                      kind: [ kind ]

According to the docs, this should work:

# targeting an object or array will produce a metric for each element
# labelsFromPath and value are relative to this path
path: [status, sub]

Or is this only for type gauge?

[adberger]

I've made a PR, but I'm not sure if this is the right approach: #2150

[adberger]

#2151