Quick question: What happens if I set the "minimum_interval_seconds" of a sensor to 0? I intend to have a very quick reaction to an external event.

Per the docs:

It’s important to note that this interval represents a minimum interval between runs of the sensor and not the exact frequency the sensor runs. If you have a sensor that takes 30 seconds to complete, but the

minimum_interval_seconds

is 5 seconds, the fastest Dagster Daemon will run the sensor is every 35 seconds. The

minimum_interval_seconds

only guarantees that the sensor is not evaluated more frequently than the given interval.

I suppose this would cause the sensor to trigger immediately as soon as it finished executing

I understand that like that too. I wonder if a value of 0 is forbidden because it "could freeze" something due to high load?

could use 0.5 to be on the safe side I suppose

It is typed Optional[int] !?

as far as I know, we don't prevent 0, and it likely works, although supporting sensor evaluations at that frequency is not a design goal for us at this time