# The central observability stack: Loki (log store) + Grafana (UI). Runs on ONE
# node — the monitoring host, `beta` (75.119.132.91 / mesh 10.10.0.2) — because
# beta is an always-on VPS with a public Caddy already fronting it. Every node's
# Alloy agent (see alloy/) ships logs here; agents on prod and the desktop reach
# Loki over the WireGuard mesh, so Loki must listen on the mesh interface.
#
# Deploy (on beta):   docker compose up -d
# Grafana is proxied by beta's Caddy at dashboard.thermograph.org (see README);
# Loki is NOT public — it binds the mesh IP only, reachable to agents over wg0.

services:
  loki:
    image: grafana/loki:3.5.1
    command: -config.file=/etc/loki/config.yml
    volumes:
      - ./loki/config.yml:/etc/loki/config.yml:ro
      - loki_data:/loki
    ports:
      # Mesh-only: agents on prod (10.10.0.1) and desktop (10.10.0.3) push here
      # over wg0. Never published on the public interface.
      - "10.10.0.2:3100:3100"
      # Also localhost, so the beta-local Alloy agent and curl checks can reach it.
      - "127.0.0.1:3100:3100"
    restart: unless-stopped

  grafana:
    image: grafana/grafana:11.6.1
    depends_on: [loki]
    environment:
      # Primary login is Google SSO (below). The admin user is kept as a
      # break-glass local fallback; its password comes from the host env
      # (.env — see .env.example), never baked into the compose file.
      GF_SECURITY_ADMIN_USER: ${GF_ADMIN_USER:-admin}
      GF_SECURITY_ADMIN_PASSWORD: ${GF_SECURITY_ADMIN_PASSWORD:?set GF_SECURITY_ADMIN_PASSWORD}
      GF_USERS_ALLOW_SIGN_UP: "false"
      GF_ANALYTICS_REPORTING_ENABLED: "false"
      GF_ANALYTICS_CHECK_FOR_UPDATES: "false"
      # Served behind Caddy at this external URL (sub-path-safe cookie/redirects).
      GF_SERVER_ROOT_URL: "https://${GRAFANA_DOMAIN:-dashboard.thermograph.org}/"
      # --- Google SSO (OIDC) -----------------------------------------------------
      # Enabled once GOOGLE_CLIENT_ID/SECRET are set in .env and OAUTH_ENABLED=true.
      # allow_sign_up is FALSE: a Google login only succeeds if a Grafana user with
      # that email already exists — so this dashboard is locked to pre-provisioned
      # accounts (see README), not "any Google user". Redirect URI to register in
      # Google Cloud: https://dashboard.thermograph.org/login/google
      GF_AUTH_GOOGLE_ENABLED: ${OAUTH_ENABLED:-false}
      GF_AUTH_GOOGLE_CLIENT_ID: ${GOOGLE_CLIENT_ID:-}
      GF_AUTH_GOOGLE_CLIENT_SECRET: ${GOOGLE_CLIENT_SECRET:-}
      GF_AUTH_GOOGLE_SCOPES: "openid email profile"
      GF_AUTH_GOOGLE_AUTH_URL: "https://accounts.google.com/o/oauth2/v2/auth"
      GF_AUTH_GOOGLE_TOKEN_URL: "https://oauth2.googleapis.com/token"
      GF_AUTH_GOOGLE_API_URL: "https://openidconnect.googleapis.com/v1/userinfo"
      GF_AUTH_GOOGLE_ALLOW_SIGN_UP: "false"
      # Match a Google login to a PRE-PROVISIONED user by email (the admin created
      # via the API has no prior Google-auth linkage). Without this, Grafana 9.3+
      # won't look up by email and instead tries to auto-create the user — which
      # allow_sign_up=false then rejects ("signup is disabled"). Safe here: Google
      # verifies email ownership and it's the only OAuth provider, so there's no
      # cross-provider takeover vector the "insecure" name warns about.
      GF_AUTH_OAUTH_ALLOW_INSECURE_EMAIL_LOOKUP: "true"
      # --- Alerting --------------------------------------------------------------
      # The Discord webhook that grafana/provisioning/alerting/contact-points.yml
      # interpolates as $DISCORD_ALERT_WEBHOOK_URL. It is a secret (holding it is
      # enough to post in the channel), so it lives only in beta's .env.
      # Required, not defaulted: a Grafana that comes up with an empty webhook
      # looks perfectly healthy and pages nobody, which is the failure mode this
      # whole config exists to end. Better to refuse to start.
      DISCORD_ALERT_WEBHOOK_URL: ${DISCORD_ALERT_WEBHOOK_URL:?set DISCORD_ALERT_WEBHOOK_URL — see .env.example}
    volumes:
      - ./grafana/provisioning:/etc/grafana/provisioning:ro
      - ./grafana/dashboards:/var/lib/grafana/dashboards:ro
      - grafana_data:/var/lib/grafana
    ports:
      # Host-local; beta's Caddy reverse-proxies to it. Not public directly.
      - "127.0.0.1:3000:3000"
    restart: unless-stopped

volumes:
  loki_data: {}
  grafana_data: {}
