Kubernetes plays an important role nowadays in enabling cloud-native telecom and managing microservices in 5G/6G networks. It provides a platform for deploying, scaling, and managing cloud-native micro-services but also 5G/6G core functionalities. In this work, we demonstrate the importance of misbehavior detection in Kubernetes clusters paired with suitable mitigation measures as a solid baseline to minimize disruption of 5G service delivery. We evidence the impact of two types of DoS attacks, blackholing and network DoS, and results of detection and mitigation in Kubernetes.