update CHANGELOG.md

Author: baskrahmer

src/lightning/pytorch/CHANGELOG.md

@@ -54,6 +54,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - Added non-layer param count to the model summary ([#17005](https://github.com/Lightning-AI/lightning/pull/17005))
 
 
+- Updated `LearningRateMonitor` to log monitored values to `trainer.callback_metrics` ([#17626](https://github.com/Lightning-AI/lightning/pull/17626))
+
+
 ### Changed
 
 - Removed the limitation to call `self.trainer.model.parameters()` in `LightningModule.configure_optimizers()` ([#17309](https://github.com/Lightning-AI/lightning/pull/17309))