Network Monitoring and Performance Questions

What to monitor in production networks, how to collect telemetry, and how to interpret performance signals to detect and resolve problems. Topics include key metrics such as bandwidth utilization, interface saturation, latency, jitter, packet loss, packet discard and error counters, device resource utilization, and application layer performance indicators. It covers telemetry collection mechanisms such as the Simple Network Management Protocol, flow telemetry such as NetFlow and sFlow, packet capture pipelines, and how to integrate logs and tracing with metric streams. The topic also includes tooling for monitoring and analysis, dashboard and alert design, baseline and anomaly detection strategies, how to correlate monitoring signals with incidents, and how monitoring data feeds capacity planning and performance tuning decisions.