## Issue description: This is an issue to improve [documentation of Tensorboard Scalars](https://www.tensorflow.org/tensorboard/scalars_and_keras). In [this Tutorial](https://www.tensorflow.org/tensorboard/scalars_and_keras), only visualization of **`Loss`** is demonstrated but usually, we visualize **`Metrics`** as well (like `Accuracy`). So, there can be a mention on how to visualize Metrics.