During February 2026, Matthieu Cuny enhanced the DataDog/integrations-core repository by expanding Istio integration monitoring capabilities. He developed and integrated new DNS request and certificate expiry metrics using Python, focusing on improving observability and risk mitigation for Istio environments. By surfacing DNS performance and certificate expiry signals, his work enabled proactive alerting and facilitated faster mean time to resolution for operational issues. The implementation emphasized robust metric collection and thorough testing, ensuring reliability and maintainability. Although the contribution was limited to a single feature over one month, it addressed a clear monitoring gap and demonstrated depth in metrics and monitoring engineering.