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Setup

Setting up local prometheus

Follow instructions in autometrics-dev. I used Docker:

docker pull prom/prometheus
# I'm using port 9092 for prometheus because 9090 is already taken on my machine
docker run \
    -p 9092:9090 \
    -v /absolute/path/to/prometheus.yml:/etc/prometheus/prometheus.yml \
    prom/prometheus

where the prometheus.yml file is:

scrape_configs:
  - job_name: python-autometrics-example-fastapi
    metrics_path: /metrics
    static_configs:
      - targets: ["localhost:8000"]
    # For a real deployment, you would want the scrape interval to be
    # longer but for testing, you want the data to show up quickly
    scrape_interval: 200ms

Configure app to use prometheus

Configure .env to use the url to your local prometheus server:

# Again, I'm using 8063 because 9090 is already taken on my machine
PROMETHEUS_URL=http://localhost:8063

Running the app

Create and activate virtual env

python3 -m venv .venv
source env/bin/activate

Install dependencies

pip install -r requirements.txt

Run app

uvicorn fastapi-example:app --reload --port=8080

Install and Configure Autometrics VSCode Extension

...

Update the VSCode Extension settings to use the url to your local prometheus server. Since I'm not using the default port, I need to update the settings:

{
  "autometrics.prometheusUrl": "http://localhost:8063"
}