Worked on the cybozu-go/mantle repository to enhance observability and tooling for Kubernetes and Ceph-backed backup and restore workflows. Focused on improving operational visibility by enriching information logs and integrating the Ceph RBD export-diff command to support data-diff export and validation. Developed deployment automation and testability features by adding configuration files, Dockerfiles, and workflow definitions, streamlining both deployment and testing processes. Utilized Go, Docker, and YAML to implement these changes, resulting in more reliable and transparent backup and restore operations. The work addressed the need for better monitoring and automation in cloud infrastructure environments using CI/CD practices.