Worked on the stackitcloud/gardener repository to enhance the reliability of Kubernetes cluster provisioning in IPv6 environments by addressing a bug in the Kubelet CSR Approver. Focused on certificate management and networking, the solution involved updating the Go-based CSR approval logic to use netip.Addr for IPv6 address comparison, ensuring both short and long forms were correctly recognized and validated. Expanded the test suite to include comprehensive IPv6 scenarios, reducing the risk of future regressions. This targeted fix improved the robustness of the CSR approval workflow, aligning the project with IPv6 readiness goals and supporting smoother cluster operations in diverse network setups.