Hello Jean-Christian
We currently don't offer to change the runtime of our managed service. Note however that you get your own K8s cluster and each worker nodes is a VM dedicated to you, therefore there is great isolation towards other clusters. Do not hesitate to launch multiple cluster and/sitribute workloads on differents workers nodes by using label constraints if you want to ensure better isolation within the cluster. We may offer other container runtime like Kata at a later stage.