Vladislav Cebotari developed and integrated the Unknown Entities Reporting feature for the cedar-policy/cedar repository, focusing on enhancing policy evaluation diagnostics. He introduced the unknown_entities method to the PartialResponse struct, enabling retrieval of all unknown entities encountered during partial evaluation. This addition, implemented in Rust and exposed through both the core policy AST and the public API, allows policy authors to better understand and iterate on evaluation outcomes. Vladislav’s work emphasized API development and policy as code, improving observability and maintainability. The feature lays a foundation for future instrumentation, reflecting a thoughtful approach to extensibility and robust policy diagnostics.