# Prometheus Configuration
# Production-ready configuration with alerting and service discovery

global:
  # Default scrape interval
  scrape_interval: 15s
  
  # Evaluation interval for rules
  evaluation_interval: 15s
  
  # Scrape timeout
  scrape_timeout: 10s

  # External labels (sent with alerts and remote write)
  external_labels:
    cluster: 'production'
    environment: 'prod'
    # region: 'us-east-1'

# Alertmanager configuration
alerting:
  alertmanagers:
    - static_configs:
        - targets:
            - alertmanager:9093
      # Timeout for Alertmanager requests
      timeout: 10s
      # API version
      api_version: v2

# Rule files - evaluate these periodically
rule_files:
  - 'rules/*.yml'

# Scrape configurations
scrape_configs:
  # ========================================
  # Prometheus self-monitoring
  # ========================================
  - job_name: 'prometheus'
    static_configs:
      - targets: ['localhost:9090']
    relabel_configs:
      - target_label: instance
        replacement: 'prometheus'

  # ========================================
  # Alertmanager
  # ========================================
  - job_name: 'alertmanager'
    static_configs:
      - targets: ['alertmanager:9093']
    relabel_configs:
      - target_label: instance
        replacement: 'alertmanager'

  # ========================================
  # Node Exporter - Host metrics
  # ========================================
  - job_name: 'node-exporter'
    # Static targets (for fixed hosts)
    static_configs:
      - targets:
          - 'node-exporter:9100'
        labels:
          env: 'production'
    
    # File-based service discovery (add/remove hosts dynamically)
    file_sd_configs:
      - files:
          - 'targets/node-exporter.yml'
        refresh_interval: 30s

    # Relabeling
    relabel_configs:
      # Extract hostname from target address
      - source_labels: [__address__]
        regex: '([^:]+):\d+'
        target_label: hostname
        replacement: '${1}'

  # ========================================
  # Docker / cAdvisor - Container metrics
  # ========================================
  - job_name: 'cadvisor'
    static_configs:
      - targets: ['cadvisor:8080']
    metric_relabel_configs:
      # Drop high-cardinality container metrics if needed
      - source_labels: [__name__]
        regex: 'container_(network_tcp_usage_total|tasks_state|cpu_load_average_10s)'
        action: drop

  # ========================================
  # Kubernetes Service Discovery (if applicable)
  # ========================================
  # - job_name: 'kubernetes-pods'
  #   kubernetes_sd_configs:
  #     - role: pod
  #   relabel_configs:
  #     - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
  #       action: keep
  #       regex: true
  #     - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
  #       action: replace
  #       target_label: __metrics_path__
  #       regex: (.+)
  #     - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
  #       action: replace
  #       regex: ([^:]+)(?::\d+)?;(\d+)
  #       replacement: $1:$2
  #       target_label: __address__
  #     - source_labels: [__meta_kubernetes_namespace]
  #       target_label: namespace
  #     - source_labels: [__meta_kubernetes_pod_name]
  #       target_label: pod

  # ========================================
  # Blackbox Exporter - Synthetic monitoring
  # ========================================
  # - job_name: 'blackbox-http'
  #   metrics_path: /probe
  #   params:
  #     module: [http_2xx]
  #   file_sd_configs:
  #     - files:
  #         - 'targets/blackbox-http.yml'
  #   relabel_configs:
  #     - source_labels: [__address__]
  #       target_label: __param_target
  #     - source_labels: [__param_target]
  #       target_label: instance
  #     - target_label: __address__
  #       replacement: blackbox-exporter:9115

# Remote write (for long-term storage)
# remote_write:
#   - url: 'http://mimir:9009/api/v1/push'
#     queue_config:
#       max_samples_per_send: 1000
#       max_shards: 200
#       capacity: 2500

# Remote read (for querying long-term storage)
# remote_read:
#   - url: 'http://mimir:9009/prometheus/api/v1/read'
#     read_recent: true