Note about class pruning

Author: tsegismont

_posts/2025-03-12-orange-telco-core-network-api-management-with-quarkus.adoc

@@ -72,6 +72,15 @@ The team reserved it for the final build stage when absolutely necessary.
 
 Some fine-tuning was required to prevent class pruning issues.
 
+[NOTE]
+====
+When building native executables, the call tree is analyzed to determine which classes and methods are used. Everything that is not used is pruned to reduce the size of the executable and the RSS usage.
+
+In some cases, e.g. when using reflection, you will have to declare explicitly that a class is used so that it ends up being included in the native executable.
+
+Quarkus provides tooling to simplify this configuration.
+====
+
 === Reactive Programming & Mutiny
 
 Having worked extensively with Reactor, the transition to Mutiny had a learning curve.