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While the supervisor won’t shut down, it can go idle and not spawn any tasks. Have a look at

idleConfig

https://druid.apache.org/docs/latest/development/extensions-core/kafka-supervisor-reference#idle-supervisor-configuration

that seems awesome ! If I understand correctly, supervisor will go idle when inactive, and will automatically becomes active again when new data arrives in the topic, am I right ? That's exactly what I was looking for. Thanks for the information !

I'm not sure whether it will restart automatically, you might check. Maybe it sleeps and polls every so often, but I don't see mention of that.