During March 2026, Kruan contributed to the cloudflare/workerd repository by developing two core features focused on queue observability and delivery feedback within WorkerQueue. Leveraging C++ and JavaScript, Kruan implemented a metrics method that exposes backlog statistics and message timestamps, integrating this metadata directly into queue handler batches for enhanced monitoring. Additionally, Kruan introduced delivery confirmation by enabling response bodies in queue send operations, which improved end-to-end visibility and reliability for batch processing. The work emphasized API development, asynchronous programming, and backend testing, resulting in deeper operational insight and supporting proactive scaling without addressing any major bug fixes during this period.