Thomas Casteleyn focused on enhancing the stability and reliability of persistent volume handling in the grafana/grafana-operator repository during March 2025. He addressed a critical issue by revising the persistent volume update strategy, shifting from RollingUpdate to Recreate to ensure compatibility with the ReadWriteOnce access mode. This change reduced upgrade risks and eliminated the need for manual remediation during stateful deployment updates. Working primarily with Kubernetes and YAML, Thomas demonstrated a strong grasp of DevOps principles by delivering a targeted bug fix that improved the operator’s resilience and aligned with ongoing reliability goals, providing clear traceability for the implemented solution.