[prometheus-kube-stack] Wrong PVC Storage Class

[barthofu]

Describe the bug a clear and concise description of what the bug is.

In my values.yaml, i've set the value of prometheus.prometheusSpec.storageSpec.volumeClaimTemplate.spec.storageClassName to longhorn-static (which is an existing storage class in my cluster), but the generated PVC by the prometheus-kube-prometheus-stack StatefulSet has longhorn as its storage class.

Here are all the storage classes present on my cluster:

NAME                   PROVISIONER             RECLAIMPOLICY   VOLUMEBINDINGMODE      ALLOWVOLUMEEXPANSION   AGE
local-path (default)   rancher.io/local-path   Delete          WaitForFirstConsumer   false                  38d
nfs-csi                nfs.csi.k8s.io          Delete          Immediate              false                  38d
longhorn-static        driver.longhorn.io      Delete          Immediate              true                   38d
longhorn (default)     driver.longhorn.io      Delete          Immediate              true                   38d

What's your helm version?

v3.16.3

What's your kubectl version?

Client Version: v1.31.2 Kustomize Version: v5.4.2 Server Version: v1.29.3+k3s1

Which chart?

kube-prometheus-stack

What's the chart version?

67.8.0

What happened?

No response

What you expected to happen?

I expect the generated PVC to have the storageClassName I provided in the values.yaml

How to reproduce it?

No response

Enter the changed values of values.yaml?

kube-prometheus-stack:
  crds:
    enabled: true

  cleanPrometheusOperatorObjectNames: true

  ###
  ### Component values
  ###
  alertmanager:
    enabled: false

  kubeApiServer:
    enabled: true
    serviceMonitor:
      metricRelabelings:
        # Drop high cardinality labels
        - action: drop
          sourceLabels: ["__name__"]
          regex: (apiserver|etcd|rest_client)_request(|_sli|_slo)_duration_seconds_bucket
        - action: drop
          sourceLabels: ["__name__"]
          regex: (apiserver_response_sizes_bucket|apiserver_watch_events_sizes_bucket)

  kubeControllerManager:
    enabled: false

  kubeEtcd:
    enabled: false

  kubelet:
    enabled: true
    serviceMonitor:
      metricRelabelings:
        # Drop high cardinality labels
        - action: labeldrop
          regex: (uid)
        - action: labeldrop
          regex: (id|name)
        - action: drop
          sourceLabels: ["__name__"]
          regex: (rest_client_request_duration_seconds_bucket|rest_client_request_duration_seconds_sum|rest_client_request_duration_seconds_count)

  kubeProxy:
    enabled: false

  kubeScheduler:
    enabled: false

  kubeStateMetrics:
    enabled: false

  nodeExporter:
    enabled: false

  grafana:
    enabled: false
    forceDeployDashboards: true
    sidecar:
      dashboards:
        annotations:
          grafana_folder: Kubernetes

  ###
  ### Prometheus operator values
  ###
  prometheusOperator:
    resources:
      requests:
        cpu: 35m
        memory: 273M
      limits:
        memory: 326M

    prometheusConfigReloader:
      # resource config for prometheusConfigReloader
      resources:
        requests:
          cpu: 5m
          memory: 32M
        limits:
          memory: 32M

  ###
  ### Prometheus instance values
  ###
  prometheus:
    ingress:
      enabled: true
      ingressClassName: traefik
      annotations:
        cert-manager.io/cluster-issuer: letsencrypt-issuer
      hosts:
        - &host prometheus.home.bartho.dev
      pathType: Prefix
      tls:
        - secretName: kube-prometheus-stack-tls
          hosts:
            - *host

    prometheusSpec:
      ruleSelectorNilUsesHelmValues: false
      serviceMonitorSelectorNilUsesHelmValues: false
      podMonitorSelectorNilUsesHelmValues: false
      probeSelectorNilUsesHelmValues: false
      scrapeConfigSelectorNilUsesHelmValues: false
      enableAdminAPI: true
      walCompression: true
      retentionSize: 8GB
      # https://github.com/prometheus-operator/prometheus-operator/blob/main/Documentation/platform/storage.md#manual-storage-provisioning
      storageSpec:
        volumeClaimTemplate:
          spec:
            storageClassName: longhorn-static
            selector:
              matchLabels:
                app.kubernetes.io/name: kube-prometheus-stack-prometheus-storage
            resources:
              requests:
                storage: 10Gi

Enter the command that you execute and failing/misfunctioning.

N/A (deployed using ArgoCD)

Anything else we need to know?

I'm using k3s, ArgoCD and Longhorn in my cluster