Concise monthly summary for 2026-03 focused on the Apache Drools repository. Key feature delivered this month, minor/no major bugs fixed, and the overall business and technical impact, including skills demonstrated. Key highlights: - Feature delivered: Self-Referencing Constraint Handling in apache/incubator-kie-drools. A new class to manage self-referencing constraints was introduced, with configurable compile-time warnings when a field is compared to itself, reducing logical errors in rule definitions. - Commit reference: 9b99105f42006a9d01d6e31eb7ab5eb57509e06c ("Add configurable compile-time warning for self-referencing constraints (fieldA == fieldA) (#6618)"). Note: No major bugs reported/fixed for this month in the provided data. Overall impact and business value: - Improves correctness and reliability of rule authoring by surfacing self-referencing mistakes at compile time, lowering defect leakage to production. - Enhances maintainability of rules by preventing subtle logical errors in Drools-based decision logic. - Strengthens quality signals for the Drools engine users, reducing debugging time and facilitating safer rule iterations. Technologies/skills demonstrated: - Java class design for constraint handling - Compile-time validation and configurable warnings - Clear traceability to commits and feature branches - Integration with Drools rule-definition lifecycle