Kubernetes Observability Core for the Solana Containerised Testbed v0.3.0

This preprint reports the migration and validation of the Solana Containerised Testbed Observability Core from a Compose-based microservice deployment to a Kubernetes-based deployment. The implementation maps the validator to a StatefulSet, the validator ledger to a PersistentVolumeClaim, wallet initialisation to a Job, and the monitor to a Deployment. Stable Services are used for RPC, Yellowstone/Geyser gRPC, and metrics endpoints. The validation was performed on a CentOS 9 host using KVM and Minikube on a legacy no-AVX2 x86_64 server. A dedicated wallet transfer validation Job confirmed that a simple SOL transfer can be executed through the Kubernetes RPC endpoint.