grafana-prometheus-alertmanager

Grafana + Prometheus + AlertManager

This stack provides basic monitoring and visualization using Prometheus and Grafana.
Prometheus collects metrics and Grafana renders dashboards from Prometheus data.

How it works

flowchart LR
    App([App / Exporter]) --> Prometheus[Prometheus :9090]
    Prometheus --> AM[Alertmanager :9093]
    Prometheus --> Data[(Time-Series DB)]
    Grafana[Grafana :3000] --> Prometheus
    User([User]) --> Grafana

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1. Prometheus starts with local scrape config from prometheus/prometheus.yml.

Open:

- Prometheus: `http://localhost:9090`
- Grafana: `http://localhost:3000`

Useful commands:

```bash
docker compose ps
docker compose logs -f
docker compose restart
docker compose down

Link app server metrics

To scrape metrics from your app server, add a target in prometheus/prometheus.yml:

- job_name: "api-server"
  static_configs:
    - targets: ["api-server:8080"]

Guidelines:

• Ensure your app exposes a Prometheus endpoint (typically /metrics).
• If your app is in Docker Compose, use the service name and container port (for example api-server:8080).
• If your app runs outside Docker, use a reachable host/IP and port.
• Restart Prometheus after config changes:

docker compose restart prometheus

Notes

• Change default Grafana credentials before exposing this stack.
• You can add additional scrape targets in prometheus/prometheus.yml.