* This cluster pool creates new workers when the others are busy, up to the maximum number of workers.
* When the maximum number of workers is reached and workers are busy, an event is emitted. If you want to listen to this event, use the pool's `emitter`.
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* This cluster pool creates new workers when the others are busy, up to the maximum number of workers.
* When the maximum number of workers is reached and workers are busy, an event is emitted. If you want to listen to this event, use the pool's `emitter`.
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