prometheus.yml.example

global:
  scrape_interval:     15s # By default, scrape targets every 15 seconds.

  # Attach these labels to any time series or alerts when communicating with
  # external systems (federation, remote storage, Alertmanager).
  external_labels:
    monitor: 'codelab-monitor'

# Scrape configurations used for local development:
# - `prometheus`: Prometheus' own internal metrics endpoint.
# - `template-api`: this project's API (expects metrics at `http://localhost:3000/metrics`).
scrape_configs:
  # Prometheus server metrics (job=prometheus)
  - job_name: 'prometheus'

    # Short interval for local testing.
    scrape_interval: 5s

    static_configs:
      - targets: ['localhost:9090']

  # The template API exposes application metrics at `/metrics`.
  # Make sure the API is running locally and exposes Prometheus metrics (e.g. using `prom-client` or middleware).
  - job_name: 'template-api'
    # Keep a short interval for fast feedback during development.
    scrape_interval: 5s
    # Prometheus will request the `/metrics` path by default, but we show it here explicitly for clarity.
    metrics_path: /metrics
    static_configs:
      - targets: ['localhost:3000']

    # Optional: relabeling examples for common local/dev setups. Uncomment and adapt as needed.
    # - Add a static label (useful for environment-specific queries)
    # relabel_configs:
    #   - target_label: env
    #     replacement: dev
    #
    # - Set `instance` to the hostname (strip port)
    #   - source_labels: [__address__]
    #     regex: '([^:]+):.*'
    #     target_label: instance
    #     replacement: '$1'
    #
    # - Drop a specific target (useful to temporarily disable scraping)
    #   - source_labels: [__address__]
    #     regex: '127\\.0\\.0\\.1:3000'
    #     action: drop
    #
    # - Preserve original address in another label before rewriting (advanced example)
    #   - source_labels: [__address__]
    #     target_label: __param_target
    #     replacement: '$1'
    #
    # Notes:
    # - `relabel_configs` run during target discovery and can add/modify/drop labels.
    # - Keep examples commented so the default local setup continues to work.