Have you used Grafana and Prometheus together?

Yes, I have used Grafana and Prometheus together for monitoring applications and infrastructure. Prometheus collects metrics from various services, and Grafana visualizes this data in user-friendly dashboards.

For example, for a Python application, you can use the prometheus_client library to export metrics:

from prometheus_client import start_http_server, Summary
import random
import time

REQUEST_TIME = Summary('request_processing_seconds', 'Time spent processing request')

@REQUEST_TIME.time()
def process_request():
    time.sleep(random.random())

if __name__ == '__main__':
    start_http_server(8000)  # starts an HTTP server for Prometheus
    while True:
        process_request()

Then, Prometheus is configured to scrape metrics from http://localhost:8000/metrics, and Grafana creates graphs based on this data.