// ============================================
      // Metrics: Discovery Kubernetes Services
      // ============================================
      
      // discovery.kubernetes "k8s_services" {
      //   role = "service"
      // }

      // ============================================
      // Metrics: Kube State Metrics (k8s_services)
      // ============================================

      // prometheus.scrape "kube_state_metrics" {
      //   job_name = "integrations/kubernetes/kube-state-metrics"
      //   targets  = discovery.relabel.kube_state_metrics.output
      // 
      //   scheme = "http"
      // 
      //   forward_to = [prometheus.remote_write.prometheus_srv.receiver]
      //  }
      
      // ============================================
      // API Server discovery
      // ============================================

      // discovery.relabel "apiserver" {
      //   targets = discovery.kubernetes.k8s_services.targets

      //   rule {
      //     source_labels = ["__meta_kubernetes_service_name"]
      //     regex         = "kubernetes"
      //     action        = "keep"
      //   }
      //   rule {
      //     target_label = "cluster"
      //     replacement  = env("CLUSTER_NAME")
      //   }
      // }

      // prometheus.scrape "apiserver" {
      //   job_name = "integrations/kubernetes/apiserver"
      //   targets  = discovery.relabel.apiserver.output

      //   scheme = "https"
      //   metrics_path = "/metrics"

      //   tls_config {
      //     server_name          = "kubernetes"
      //     ca_file              = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
      //     insecure_skip_verify = true
      //   }

      //   bearer_token_file = "/var/run/secrets/kubernetes.io/serviceaccount/token"

      //   forward_to = [prometheus.remote_write.prometheus_srv.receiver]
      // }

      // ============================================
      // CoreDNS discovery
      // ============================================
      // discovery.relabel "coredns" {
      //   targets = discovery.kubernetes.k8s_services.targets
      // 
      //  rule {
      //    source_labels = ["__meta_kubernetes_pod_label_k8s_app"]
      //    regex         = "kube-dns"
      //    action        = "keep"
      //  }
      //  rule {
      //     target_label = "cluster"
      //    replacement  = env("CLUSTER_NAME")
      //   }
      // }

      // prometheus.scrape "coredns" {
      //   job_name = "integrations/kubernetes/coredns-pods"
      //   targets  = discovery.relabel.coredns.output

      //   scheme = "http"
      //   metrics_path = "/metrics"
      // 
      //   forward_to = [prometheus.remote_write.prometheus_srv.receiver]
      // }


      // ============================================
      // Prometheus: prometheus_srv
      // ============================================

      prometheus.remote_write "prometheus_srv" {
  
        endpoint {
          url = env("PROMETHEUS_URL")
        }

        // global labels
        external_labels = {
          cluster = env("CLUSTER_NAME"),
          zone    = env("ZONE"),
        }

      }

      // ===============================================================================
      // prometheus / Metrics - Node exporter
      // Requirements: 
      //  - discovery.relabel - node_exporter
      // ===============================================================================
      prometheus.scrape "node_exporter" {
        job_name   = "integrations/kubernetes/node-exporter"
        targets    = discovery.relabel.node_exporter.output
        scheme     = "http"
        forward_to = [prometheus.remote_write.prometheus_srv.receiver]
      }


      discovery.relabel "node_exporter" {
        targets = discovery.kubernetes.kube_pods.targets

        rule {
          source_labels = ["__meta_kubernetes_pod_label_app_kubernetes_io_name"]
          regex         = "node-exporter|prometheus-node-exporter"
          action        = "keep"
        }

        rule {
          source_labels = ["__meta_kubernetes_pod_container_port_number"]
          regex         = "9100"
          action        = "keep"
        }

        rule {
          source_labels = ["__meta_kubernetes_pod_node_name"]
          target_label  = "node"
        }

        rule {
          source_labels = ["__meta_kubernetes_pod_node_name"]
          target_label  = "nodename"
        }

        rule {
          source_labels = ["__meta_kubernetes_pod_node_name"]
          target_label  = "instance"
        }
      }