# on_closed
`toloka.streaming.observer.PoolStatusObserver.on_closed` | [Source code](https://github.com/Toloka/toloka-kit/blob/v0.1.26/src/streaming/observer.py#L227)

```python
on_closed(self, callback: Union[Callable[[Pool], None], Callable[[Pool], Awaitable[None]]])
```

