During October 2024, Lelutin enhanced the prometheus/prometheus repository by improving the reliability of unit tests for time-dependent functions. Focusing on documentation, Lelutin clarified that the time() function initializes at zero within unit tests, which enables deterministic outcomes for time-based rule evaluations. This update addressed a common source of flaky tests and reduced quality assurance overhead by making test results more predictable. The work involved Markdown documentation, Go testing practices, and an understanding of promtool test semantics. Lelutin’s contribution deepened the project’s testing rigor, supporting better developer experience and more robust software development workflows without introducing new bug fixes.