Liudmila Udot developed comprehensive retry statistics documentation and accompanying unit tests for the envoyproxy/envoy repository. She introduced a new section that clarifies the distinction between upstream and retry-specific request counters, using concrete examples to illustrate how different retry scenarios affect these metrics. Her work involved C++ development for the unit tests, as well as Markdown for user-facing documentation, ensuring that the technical details were both accurate and accessible. By updating related router filter documentation and validating counter semantics through targeted tests, Liudmila improved the observability of retry behavior, ultimately reducing debugging time and enhancing the reliability of the codebase.