How can I use the Prometheus Python client library with Flask?

How can I use the Prometheus Python client library with Flask?

You can integrate the Prometheus Python client library with Flask by following these steps: 1. Install the library using pip: pip install prometheus_flask_exporter. 2. Import the library in your Flask app. 3. Initialize the exporter with your Flask app instance. 4. Define metrics and expose them at a specific endpoint.

Can you show me a code example?

Sure! Here's a simple example:

from flask import Flask
from prometheus_flask_exporter import PrometheusMetrics

app = Flask(__name__)
metrics = PrometheusMetrics(app)

@app.route('/')
def hello():
    return 'Hello, World!'

if __name__ == '__main__':
    app.run()

This will expose metrics at /metrics.

What metrics can I track with this library?

You can track various metrics such as request counts, response times, and custom application metrics. The library provides built-in metrics like http_requests_total and http_request_duration_seconds.

How do I visualize these metrics?

You can visualize the metrics using Grafana or Prometheus itself. Set up a Prometheus server to scrape the metrics from your Flask app, and then use Grafana to create dashboards based on the collected data.