Merge branch 'book-v4' into conflicts-metrics-md

docs/book/src/reference/metrics.md

@@ -1,6 +1,6 @@
 # Metrics
 
-By default, controller-runtime builds a global prometheus registry and
+By default, controller-runtime builds a global Prometheus registry and
 publishes [a collection of performance metrics](/reference/metrics-reference.md) for each controller.
 
 
@@ -25,6 +25,7 @@ your project to use the image from another source.
 
 </aside>
 
+
 ## Metrics Configuration
 
 By looking at the file `config/default/kustomization.yaml` you can
@@ -369,4 +370,4 @@ particularly during critical periods when monitoring and diagnosing issues in re
 
 An [issue](https://github.com/kubernetes-sigs/controller-runtime/issues/2781) has been opened to
 enhance the controller-runtime and address these considerations.
-</aside>
+</aside>