This is a simple example of how to use Prometheus with Express. To run this example, you need to have Docker installed.

1. Clone this repository
2. Clone Dockprom
3. Access the dockprom folder
4. In dockprom folder, access the prometheus/prometheus.yml file and add the following lines at the end scrape_configs

  - job_name: nodejs
    scrape_interval: 10s
    honor_labels: true
    static_configs:
    - targets: ['172.17.0.1:3333'] # 'node-app', 'localhost:3333', 'host.docker.internal:9991'

Note: If you are using Windows or Mac and your app is running at the host machine, you need to use host.docker.internal instead of localhost. If you are using Linux, you should use 172.17.0.1. If you are running the app together with dockprom, you can use your-app-service as target.

5. Run docker-compose up -d in dockprom folder

If you are running your app at the host machine, you need to change the targets in prometheus.yml to host.docker.internal:9991 for Mac or Windows or 172.17.0.1:3333 for Linux.

6. Access this repository folder
7. Run npm install
8. Run docker-compose up -d
9. Access http://localhost:3333 to see the app running
10. Access http://localhost:9090 to see Prometheus running
11. Access http://localhost:3000 to see Grafana running