# Local Prometheus + Grafana for pi-prometheus.
#
#   1. replace <you> in the pi-targets bind mount below
#   2. docker compose -f examples/docker-compose.yml up -d
#   3. pi
#   4. http://localhost:3000 → folder "Pi" → both dashboards, filled in under a
#      minute (15s scrape, 15s file_sd refresh)
#
# Grafana runs with anonymous admin access. This stack listens on localhost and
# is meant for one developer's laptop, nothing else.
#
# macOS and Windows work as written. On Linux, host.docker.internal points at
# the host bridge address and will NOT reach a listener bound to the host
# loopback, which is where Pi binds. Give the prometheus service
# `network_mode: host` instead, and drop its ports/extra_hosts entries.

name: pi-prometheus

services:
  prometheus:
    image: prom/prometheus:v3.14.0
    ports:
      - "127.0.0.1:9090:9090"
    extra_hosts:
      - "host.docker.internal:host-gateway"
    volumes:
      - ./provisioning/prometheus.yml:/etc/prometheus/prometheus.yml:ro
      - ./alerts.yml:/etc/prometheus/alerts.yml:ro
      # replace <you>, Docker Compose does not expand ~
      # The directory must exist before the stack starts. Pi creates it on its
      # first run; otherwise: mkdir -p ~/.pi/metrics/targets
      - /Users/<you>/.pi/metrics/targets:/pi-targets:ro
      - prometheus-data:/prometheus
    command:
      - --config.file=/etc/prometheus/prometheus.yml
      - --storage.tsdb.path=/prometheus
      - --web.enable-lifecycle

  # The two dashboards carry the grafana.com "${DS_PROMETHEUS}" input
  # placeholder, which is what grafana.com's importer resolves. File
  # provisioning never resolves it: Grafana expands environment variables in
  # provisioning configs but never inside dashboard JSON. So bind the
  # placeholder to the provisioned datasource uid before Grafana reads it.
  dashboard-prep:
    image: alpine:3.22
    volumes:
      - ./grafana-dashboard.json:/in/grafana-dashboard.json:ro
      - ./grafana-dashboard-attribution.json:/in/grafana-dashboard-attribution.json:ro
      - grafana-dashboards:/out
    command:
      - sh
      - -c
      - |
        set -e
        for f in /in/*.json; do
          sed 's/[$$]{DS_PROMETHEUS}/pi-prometheus-ds/g' "$$f" > "/out/$$(basename "$$f")"
        done

  grafana:
    image: grafana/grafana:13.2.0
    ports:
      - "127.0.0.1:3000:3000"
    depends_on:
      prometheus:
        condition: service_started
      dashboard-prep:
        condition: service_completed_successfully
    environment:
      GF_AUTH_ANONYMOUS_ENABLED: "true"
      GF_AUTH_ANONYMOUS_ORG_ROLE: Admin
      GF_AUTH_DISABLE_LOGIN_FORM: "true"
      GF_USERS_DEFAULT_THEME: dark
    volumes:
      - ./provisioning/grafana/datasources:/etc/grafana/provisioning/datasources:ro
      - ./provisioning/grafana/dashboards:/etc/grafana/provisioning/dashboards:ro
      - grafana-dashboards:/var/lib/grafana-dashboards
      - grafana-data:/var/lib/grafana

volumes:
  prometheus-data:
  grafana-data:
  grafana-dashboards: