September 2025 monthly summary for google/perfetto focusing on feature delivery and code quality improvements. This month, the team delivered an initial plugin extension for YouTube CUJs within the Perfetto UI, enabling targeted analysis by pinning specific jank tracks for main and all threads. The feature includes registration and execution commands that leverage existing Perfetto data retrieval modules, enabling streamlined workflows for performance engineers analyzing YouTube-related performance issues. Major outcomes include a concrete plugin scaffold with end-to-end capability for YouTube CUJ analysis, laying groundwork for additional CUJ plugins and broader UI extensibility. No major bug fixes were recorded this month for this repository; efforts were concentrated on delivering a robust feature that can be iterated on in the next cycle.