Traditional network monitoring tools based on SNMP polling and NetFlow are struggling to keep pace with the dynamic, ephemeral nature of cloud-native infrastructure. OpenTelemetry is extending its scope from application observability to network telemetry, while eBPF-based tools provide granular flow visibility without the overhead of kernel module-based approaches.
Modern Network Observability Architecture
OpenTelemetry network instrumentation captures connection-level metrics, DNS resolution times, and TLS handshake latency as spans and metrics that integrate with existing observability backends like Grafana, Datadog, and Splunk. This unifies application and network observability into a single correlation framework.
eBPF-based network observability tools like Hubble (from the Cilium project) and Retina provide pod-to-pod, service-to-service, and external traffic flow maps without sampling. By attaching to kernel network hooks, these tools capture every packet decision with minimal CPU overhead, enabling troubleshooting of intermittent connectivity issues and security investigations.
Combining OpenTelemetry traces with eBPF flow data enables teams to answer questions like "which network path did this specific request take?" and "what DNS resolution was performed for this failed API call?" This level of end-to-end visibility dramatically reduces mean time to resolution for complex distributed system failures.