System Performance and Troubleshooting Questions

Systematic methods for diagnosing, analyzing, and resolving production reliability and performance problems. Covers root cause analysis methodology, correlation of logs and metrics, use of monitoring and tracing to localize issues, profiling at the operating system and application level, analysis of central processing unit and memory usage, identification of input output and network bottlenecks, kernel and configuration tuning considerations, capacity testing and load validation, mitigation patterns such as caching and sharding, prioritization and rollback plans, and post incident actions to prevent recurrence.