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Airflow, for instance, have <https://airflow.apache.org/docs/apache-airflow/stable/concepts/sensors.html|Sensors>. Sensors wait for something external to happen.

We don’t have sensors, but you could put the polling logic inside a task or a flow. Or you can make the event trigger the flow like i mentioned above

I suppose that is not as good as exposing blocking tasks as REST endpoints. I’ll need to find another product. I see that Google Workflows have callbacks ( <https://cloud.google.com/workflows/docs/creating-callback-endpoints> ) . It’s unfortunate that Prefect doesn’t have this.

<@U03EB5FNY59> we have a detailed walkthrough about how you can approach it <https://discourse.prefect.io/t/is-there-an-equivalent-to-sensors-in-prefect-how-do-i-trigger-event-driven-workflows/76|here>

Prefect provides several methods of approaching that problem, even if we don't call it sensors. Happy to answer your questions about this orchestration pattern - what's the use case you tried to solve with sensors? Are you waiting for some files to arrive?