We encourage federating a Windows- or Linux-based server running Utility Network services with ArcGIS Enterprise on Kubernetes. This allows those services to stay on Network Management releases for an extended period of time (e.g. several years), but still enjoy the scaling benefits of cloud-native software for other services and applications that can adhere to the much faster product lifecycle of ArcGIS Enterprise on Kubernetes.
Please reach out to your Esri representative so we can learn more about your use case and drivers for running UN services on Kubernetes. Thank you-