apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-all-internal
  namespace: monitoring
spec:
  podSelector: {}
  policyTypes:
    - Ingress
    - Egress
  ingress:
    - from:
        - podSelector: {}
  egress:
    - to:
        - podSelector: {}
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-ingress-to-grafana
  namespace: monitoring
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/name: grafana
  policyTypes:
    - Ingress
  ingress:
    - from:
        - namespaceSelector:
            matchLabels:
              name: kube-system
        - podSelector:
            matchLabels:
              app: traefik
        - {}
---
apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: allow-external-ingress-to-grafana
  namespace: monitoring
spec:
  podSelector:
    matchLabels:
      app.kubernetes.io/name: grafana
  policyTypes:
    - Ingress
  ingress:
    - from: 
        - ipBlock:
            cidr: 0.0.0.0/0
  egress:
    - to:
        - podSelector: {}