To run the application locally without Docker (development mode with hot reload):

npm install
npm run start:dev

This will run the application directly on your machine and reflect code changes immediately.

To run the application in development mode with hot reload inside Docker:

docker build -t perf-monitoring-dev --target dev .
docker run -p 4432:4432 --name perf-dev -v $(pwd):/app -d perf-monitoring-dev

The volume -v $(pwd):/app ensures that changes in your local code are immediately reflected inside the container.

To run the application in production mode:

docker build -t perf-monitoring-prod --target runtime .
docker run -p 4432:4432 --name perf-prod -d perf-monitoring-prod

The production version only uses the compiled files in dist/ and installs production dependencies, resulting in a smaller and faster image.

After running the container or starting locally, open in your browser or Postman:

http://localhost:4432

You can access the monitoring tools at their default ports:

• Prometheus: http://localhost:9090
• Grafana: http://localhost:3000

• Dockerfile (or Dockerfile.dev / Dockerfile.prod)
• .dockerignore (to ignore node_modules, dist, and sensitive files)
• package.json / package-lock.json
• NestJS source code (src/)

• For faster future builds, Docker uses layer caching (npm install and build).
• Do not upload node_modules or dist/ to GitHub; use .dockerignore.
• Next steps would be to add Prometheus and Grafana to Docker, but that can be done later.