logging {
  level = "warn"
}


// ============================================
// Discovery: Kubernetes - pods 
// ============================================

discovery.kubernetes "kube_pods" {
  role = "pod"
}

// ============================================
// Logs: Loki config
// ============================================

loki.write "loki_srv" {
  endpoint {
    url = sys.env("LOKI_URL")
  }
}

loki.process "loki_srv" {
  stage.static_labels {
    values = {
      cluster = sys.env("CLUSTER_NAME"),
      zone    = sys.env("ZONE"),
      job     = "integrations/kubernetes/pod-logs",
    }
  }
  forward_to = [loki.write.loki_srv.receiver]
}


// ============================================
// Loki.source  kube_pod_logs
// Requirements: 
//  - discovery.relabel: kube_pod_logs
//  - discovery.process: loki_srv
// ============================================

loki.source.kubernetes "kube_pod_logs" {
  targets    = discovery.relabel.kube_pod_logs.output
  forward_to = [loki.process.loki_srv.receiver]
}


// ============================================
// Discovery:relabel: kube_pod_logs
// Requirements: 
//  - discovery.kubernetes.role.pod: kube_pods
// ============================================

discovery.relabel "kube_pod_logs" {
  targets = discovery.kubernetes.kube_pods.targets
  rule {
    source_labels = ["__meta_kubernetes_namespace"]
    target_label  = "namespace"
  }

  rule {
    source_labels = ["__meta_kubernetes_pod_name"]
    regex        = "^(.+?)-[0-9a-zA-Z]{4,16}(?:-[0-9a-zA-Z]{4,16})?$"
    replacement  = "$1"
    target_label = "pod"
  }

  rule {
    source_labels = ["__meta_kubernetes_pod_container_name"]
    target_label = "container"
  }

  rule {
    source_labels = ["__meta_kubernetes_node_name"]
    target_label  = "node_name"
  }

  rule {
    source_labels = [
      "__meta_kubernetes_pod_controller_name",
    ]
    regex        = "([0-9a-z-.]+?)(-[0-9a-f]{8,10})?"
    target_label = "controller"
  }

  rule {
    source_labels = [
      "__meta_kubernetes_pod_label_app_kubernetes_io_name",
      "__meta_kubernetes_pod_label_app",
      "controller_name",
      "__meta_kubernetes_pod_name",
    ]
    regex        = "^;*([^;]+)(;.*)?$"
    target_label = "app"
  }

  rule {
    source_labels = ["__meta_kubernetes_pod_node_name"]
    separator     = ":"
    target_label  = "host"
  }
}