pods is forbidden: User "system:serviceaccount:kube-system:default" cannot list resource "pods" in API group "" at the cluster scope (Kubeclient::HttpError) code example

Example: pods is forbidden: User "system:serviceaccount:kube-system:default" cannot list resource "pods" in API group "" at the cluster scope (Kubeclient::HttpError)

---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: fluentd
  namespace: system

---
apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
  name: fluentd
  namespace: system
rules:
- apiGroups:
  - ""
  resources:
  - pods
  verbs:
  - get
  - list
  - watch

---
kind: ClusterRoleBinding
apiVersion: rbac.authorization.k8s.io/v1beta1
metadata:
  name: fluentd
roleRef:
  kind: ClusterRole
  name: fluentd
  apiGroup: rbac.authorization.k8s.io
subjects:
- kind: ServiceAccount
  name: fluentd
  namespace: system

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: fluentd
  namespace: system
data:
  fluent.conf: |
    @include kubernetes.conf

    
       type elasticsearch
       log_level info
       include_tag_key true
       host elastic.system.svc.cluster.local
       port 9200
       user elastic
       password <...>
       logstash_format true
       buffer_chunk_limit 2M
       buffer_queue_limit 32
       flush_interval 5s
       max_retry_wait 30
       disable_retry_limit
       num_threads 8
    

---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: fluentd
  namespace: system
  labels:
    k8s-app: fluentd-logging
    version: v1
    kubernetes.io/cluster-service: "true"
spec:
  template:
    metadata:
      labels:
        k8s-app: fluentd-logging
        version: v1
        kubernetes.io/cluster-service: "true"
    spec:
      serviceAccount: fluentd
      serviceAccountName: fluentd
      containers:
        - name: fluentd
          image: fluent/fluentd-kubernetes-daemonset:elasticsearch
          volumeMounts:
            - name: varlog
              mountPath: /var/log
            - name: varlibdockercontainers
              mountPath: /var/lib/docker/containers
            - name: config
              mountPath: /fluentd/etc/fluent.conf
              subPath: fluent.conf
      volumes:
        - name: varlog
          hostPath:
            path: /var/log
        - name: varlibdockercontainers
          hostPath:
            path: /var/lib/docker/containers
        - name: config
          configMap:
            name: fluentd