Worked on enhancing observability in the elastic/ecs-logging-java repository by implementing a customizable MDC serializer for the ECS Log4j2 layout. Developed a new resolver class and updated the layout configuration to support flexible serialization of diagnostic context data, allowing teams to tailor logging output to their operational needs. This approach leveraged Java, Log4j2, and configuration-driven extension patterns to improve the precision and adaptability of log data. The work addressed a specific feature request, enabling more effective debugging and monitoring without introducing new bugs, and was validated through integration with the existing ECS layout and Java logging ecosystem.