Performance Analysis and Metrics Questions

Evaluate the ability to interpret system performance signals and identify bottlenecks. Candidates should be comfortable reading CPU usage, memory usage, disk input output and network metrics, correlating time series, setting baselines, and using tools such as top and htop, iostat and sar or cloud monitoring dashboards. Coverage should include root cause identification for resource related issues, experiment design to validate hypotheses, trade offs for optimizations, and how to communicate performance findings to engineering and product stakeholders.