---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: prometheus
  namespace: monitoring

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: prometheus
rules:
- apiGroups: [""]
  resources:
  - nodes
  - nodes/proxy
  - services
  - endpoints
  - pods
  verbs: ["get", "list", "watch"]
- apiGroups:
  - extensions
  resources:
  - ingresses
  verbs: ["get", "list", "watch"]
- nonResourceURLs: ["/metrics"]
  verbs: ["get"]

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: prometheus
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: prometheus
subjects:
- kind: ServiceAccount
  name: prometheus
  namespace: monitoring

---
apiVersion: v1
kind: ConfigMap
metadata:
  name: prometheus-config
  namespace: monitoring
data:
  prometheus.yml: |
    global:
      scrape_interval: 30s
      evaluation_interval: 30s
      external_labels:
        cluster: 'bakery-ia'
        environment: 'production'

    # AlertManager configuration
    alerting:
      alertmanagers:
      - static_configs:
        - targets:
          - alertmanager-0.alertmanager.monitoring.svc.cluster.local:9093
          - alertmanager-1.alertmanager.monitoring.svc.cluster.local:9093
          - alertmanager-2.alertmanager.monitoring.svc.cluster.local:9093

    # Load alert rules
    rule_files:
      - '/etc/prometheus/rules/*.yml'

    scrape_configs:
      # Scrape Prometheus itself
      - job_name: 'prometheus'
        static_configs:
          - targets: ['localhost:9090']

      # Scrape all bakery-ia services
      - job_name: 'bakery-services'
        kubernetes_sd_configs:
          - role: pod
            namespaces:
              names:
                - bakery-ia
        relabel_configs:
          # Only scrape pods with metrics port
          - source_labels: [__meta_kubernetes_pod_container_port_name]
            action: keep
            regex: http

          # Add service name label
          - source_labels: [__meta_kubernetes_pod_label_app_kubernetes_io_name]
            target_label: service

          # Add component label
          - source_labels: [__meta_kubernetes_pod_label_app_kubernetes_io_component]
            target_label: component

          # Add pod name
          - source_labels: [__meta_kubernetes_pod_name]
            target_label: pod

          # Set metrics path
          - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
            action: replace
            target_label: __metrics_path__
            regex: (.+)

          # Set scrape port
          - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
            action: replace
            regex: ([^:]+)(?::\d+)?;(\d+)
            replacement: $1:$2
            target_label: __address__

      # Scrape Kubernetes nodes
      - job_name: 'kubernetes-nodes'
        kubernetes_sd_configs:
          - role: node
        relabel_configs:
          - action: labelmap
            regex: __meta_kubernetes_node_label_(.+)
          - target_label: __address__
            replacement: kubernetes.default.svc:443
          - source_labels: [__meta_kubernetes_node_name]
            regex: (.+)
            target_label: __metrics_path__
            replacement: /api/v1/nodes/${1}/proxy/metrics

      # Scrape AlertManager
      - job_name: 'alertmanager'
        static_configs:
          - targets:
            - alertmanager-0.alertmanager.monitoring.svc.cluster.local:9093
            - alertmanager-1.alertmanager.monitoring.svc.cluster.local:9093
            - alertmanager-2.alertmanager.monitoring.svc.cluster.local:9093

      # Scrape PostgreSQL exporter
      - job_name: 'postgres-exporter'
        static_configs:
          - targets: ['postgres-exporter.monitoring.svc.cluster.local:9187']

      # Scrape Node Exporter
      - job_name: 'node-exporter'
        kubernetes_sd_configs:
          - role: node
        relabel_configs:
          - source_labels: [__address__]
            regex: '(.*):10250'
            replacement: '${1}:9100'
            target_label: __address__
          - source_labels: [__meta_kubernetes_node_name]
            target_label: node

---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: prometheus
  namespace: monitoring
  labels:
    app: prometheus
spec:
  serviceName: prometheus
  replicas: 2
  selector:
    matchLabels:
      app: prometheus
  template:
    metadata:
      labels:
        app: prometheus
    spec:
      serviceAccountName: prometheus
      affinity:
        podAntiAffinity:
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 100
            podAffinityTerm:
              labelSelector:
                matchExpressions:
                - key: app
                  operator: In
                  values:
                  - prometheus
              topologyKey: kubernetes.io/hostname
      containers:
      - name: prometheus
        image: prom/prometheus:v3.0.1
        args:
          - '--config.file=/etc/prometheus/prometheus.yml'
          - '--storage.tsdb.path=/prometheus'
          - '--storage.tsdb.retention.time=30d'
          - '--web.console.libraries=/usr/share/prometheus/console_libraries'
          - '--web.console.templates=/usr/share/prometheus/consoles'
          - '--web.enable-lifecycle'
        ports:
        - containerPort: 9090
          name: web
        volumeMounts:
        - name: prometheus-config
          mountPath: /etc/prometheus
        - name: prometheus-rules
          mountPath: /etc/prometheus/rules
        - name: prometheus-storage
          mountPath: /prometheus
        resources:
          requests:
            memory: "1Gi"
            cpu: "500m"
          limits:
            memory: "2Gi"
            cpu: "1"
        livenessProbe:
          httpGet:
            path: /-/healthy
            port: 9090
          initialDelaySeconds: 30
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /-/ready
            port: 9090
          initialDelaySeconds: 5
          periodSeconds: 5
      volumes:
      - name: prometheus-config
        configMap:
          name: prometheus-config
      - name: prometheus-rules
        configMap:
          name: prometheus-alert-rules

  volumeClaimTemplates:
  - metadata:
      name: prometheus-storage
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 20Gi

---
apiVersion: v1
kind: Service
metadata:
  name: prometheus
  namespace: monitoring
  labels:
    app: prometheus
spec:
  type: ClusterIP
  clusterIP: None
  ports:
  - port: 9090
    targetPort: 9090
    protocol: TCP
    name: web
  selector:
    app: prometheus

---
apiVersion: v1
kind: Service
metadata:
  name: prometheus-external
  namespace: monitoring
  labels:
    app: prometheus
spec:
  type: ClusterIP
  ports:
  - port: 9090
    targetPort: 9090
    protocol: TCP
    name: web
  selector:
    app: prometheus