* Events that can currently be listened to:
*
* - `'ready'`: Emitted when the number of workers created in the pool has reached the minimum size expected and are ready.
- * - `'busy'`: Emitted when the number of workers created in the pool has reached the maximum size expected and are executing at least one task.
+ * - `'busy'`: Emitted when the number of workers created in the pool has reached the maximum size expected and are executing concurrently their tasks quota.
* - `'full'`: Emitted when the pool is dynamic and the number of workers created has reached the maximum size expected.
* - `'destroy'`: Emitted when the pool is destroyed.
* - `'error'`: Emitted when an uncaught error occurs.