Remove the deprecated device_stats_monitor.prefix_keys

src/pytorch_lightning/CHANGELOG.md

@@ -255,6 +255,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 - Removed the deprecated `Trainer.{validated,tested,predicted}_ckpt_path` ([#14897](https://github.com/Lightning-AI/lightning/pull/14897))
 
+- Removed the deprecated `device_stats_monitor_prefix_metric_keys` ([#14890](https://github.com/Lightning-AI/lightning/pull/14890))
+
 
 ### Fixed
 

src/pytorch_lightning/callbacks/device_stats_monitor.py

@@ -112,12 +112,3 @@ def on_train_batch_end(
 
 def _prefix_metric_keys(metrics_dict: Dict[str, float], prefix: str, separator: str) -> Dict[str, float]:
     return {prefix + separator + k: v for k, v in metrics_dict.items()}
-
-
-def prefix_metric_keys(metrics_dict: Dict[str, float], prefix: str) -> Dict[str, float]:
-    rank_zero_deprecation(
-        "`pytorch_lightning.callbacks.device_stats_monitor.prefix_metrics`"
-        " is deprecated in v1.6 and will be removed in v1.8."
-    )
-    sep = ""
-    return _prefix_metric_keys(metrics_dict, prefix, sep)

tests/tests_pytorch/deprecated_api/test_remove_1-8.py

@@ -52,13 +52,6 @@ def on_init_end(self, trainer):
         trainer.validate(model)
 
 
-def test_v_1_8_0_deprecated_device_stats_monitor_prefix_metric_keys():
-    from pytorch_lightning.callbacks.device_stats_monitor import prefix_metric_keys
-
-    with pytest.deprecated_call(match="in v1.6 and will be removed in v1.8"):
-        prefix_metric_keys({"foo": 1.0}, "bar")
-
-
 def test_v1_8_0_remove_on_batch_start_end(tmpdir):
     class TestCallback(Callback):
         def on_batch_start(self, *args, **kwargs):