Collect metrics on scrape instead of timer

The prometheus docs on exporters say:

Metrics should only be pulled from the application when Prometheus scrapes them, exporters should not perform scrapes based on their own timers. That is, all scrapes should be synchronous.

The very first example provided by this repository goes against those docs by just spamming the same function on a timer.

Can anyone provide a basic example that shows how to start a metrics collection only when prometheus connects to the exporter, as it's actually supposed to be done? Because christ, it's faster to just set up a flask server with a custom /metrics endpoint than actually figure out how to do so using this framework.

Commencez par la documentation sur la planification des Prometheus exporters et le premier exemple du dépôt, que l’issue identifie comme étant basé sur un timer. Ajoutez un exemple de base montrant que la collecte démarre de manière synchrone lorsque Prometheus scrape l’exporter ; le travail est terminé lorsque l’exemple n’effectue plus la collecte avec son propre timer.