Prune deprecated metrics (#8586)

* drop metrics

* drop tests

* fix imports

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: Borda

CHANGELOG.md

@@ -58,7 +58,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Removed
 
--
+- Removed deprecated `metrics` ([#8586](https://github.com/PyTorchLightning/pytorch-lightning/pull/8586/))
 
 
 - Removed the `outputs` argument in both the `LightningModule.on_train_epoch_end` and `Callback.on_train_epoch_end` hooks ([#8587](https://github.com/PyTorchLightning/pytorch-lightning/pull/8587))
@@ -93,7 +93,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Added
 
-- Added `extract_batch_size` utility and corresponding tests to extract batch dimension from multiple batch types. ([#8357](https://github.com/PyTorchLightning/pytorch-lightning/pull/8357/))
+- Added `extract_batch_size` utility and corresponding tests to extract batch dimension from multiple batch types ([#8357](https://github.com/PyTorchLightning/pytorch-lightning/pull/8357/))
 - Added support for named parameter groups in `LearningRateMonitor` ([#7987](https://github.com/PyTorchLightning/pytorch-lightning/pull/7987))
 - Added `dataclass` support for `pytorch_lightning.utilities.apply_to_collection` ([#7935](https://github.com/PyTorchLightning/pytorch-lightning/pull/7935))
 - Added support to `LightningModule.to_torchscript` for saving to custom filesystems with `fsspec` ([#7617](https://github.com/PyTorchLightning/pytorch-lightning/pull/7617))

pytorch_lightning/__init__.py

@@ -17,13 +17,12 @@
 _PACKAGE_ROOT = os.path.dirname(__file__)
 _PROJECT_ROOT = os.path.dirname(_PACKAGE_ROOT)
 
-from pytorch_lightning import metrics  # noqa: E402
 from pytorch_lightning.callbacks import Callback  # noqa: E402
 from pytorch_lightning.core import LightningDataModule, LightningModule  # noqa: E402
 from pytorch_lightning.trainer import Trainer  # noqa: E402
 from pytorch_lightning.utilities.seed import seed_everything  # noqa: E402
 
-__all__ = ["Trainer", "LightningDataModule", "LightningModule", "Callback", "seed_everything", "metrics"]
+__all__ = ["Trainer", "LightningDataModule", "LightningModule", "Callback", "seed_everything"]
 
 # for compatibility with namespace packages
 __import__("pkg_resources").declare_namespace(__name__)