During December 2025, Zadorovskyi focused on enhancing observability within the xm-online/xm-commons repository by addressing a critical issue with JVM metrics publishing to Prometheus using Micrometer. He resolved a bug that previously hindered reliable metric data, ensuring accurate and consistent visibility for dashboards and alerting systems. Additionally, he refactored Kafka metrics into a dedicated configuration file, streamlining organization and simplifying future maintenance. Working primarily with Java, Kafka, and Prometheus, Zadorovskyi’s efforts reduced operational risk and configuration complexity. His work demonstrated a thoughtful approach to maintainability and reliability, emphasizing depth in metric management and operational transparency for microservices environments.