Hubble is a tool that enhances the monitoring of network traffic in Cilium-managed Kubernetes environments by providing both command-line and user interface capabilities. It collects and aggregates network data from all pods, offering insights into request throughput, status, and errors, and integrates with OpenTelemetry for exporting logs and traces. Hubble operates through servers and the Hubble Relay, which together monitor multiple levels of network traffic and make data accessible via APIs. While the Hubble CLI offers detailed network-level visibility, allowing users to identify issues like dropped requests and policy misconfigurations, the Hubble UI provides a high-level service map for understanding overall cluster interactions. Both interfaces use the same data points, enabling comprehensive troubleshooting and policy evaluation in Kubernetes networks.