December 2025 monthly summary for cncf/foundation focusing on governance and project stewardship activities within Envoy Gateway. Key feature delivered: Envoy Gateway Maintainer Status Update to reflect current leadership and responsibilities (commit 4cf34b2ab3fed22de40c12056d2d3b81201050f8, Signed-off-by: kkk777-7 <kota.kimura0725@gmail.com>). This update provides governance clarity, enabling smoother maintainer onboarding and faster, more informed decision-making. Major bugs fixed: No major bug fixes reported for cncf/foundation in December 2025; the primary effort was governance-related maintenance to ensure alignment with roadmap and contributor expectations. Overall impact and accomplishments: Strengthened project governance for Envoy Gateway within the cncf/foundation repository. The maintainer status update reduces ambiguity in leadership roles, shortens onboarding for new maintainers, and improves accountability and traceability of changes affecting the Envoy Gateway project. This supports stable release planning and collaboration across teams. Technologies/skills demonstrated: Git-based change management, DCO signing-off practices, governance documentation, cross-team collaboration, and contributor onboarding improvements.