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0+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes .
Production observability interview questions separate engineers who have shipped from those who have only developed locally. This module covers structured logging with Lograge (single-line JSON replacing Rails' multi-line format) and Semantic Logger, correlation IDs propagated via Rack middleware or Thread.current, rack-mini-profiler for SQL and rendering time in development, Skylight vs Scout APM vs Datadog APM for production traces, derailed_benchmarks and memory_profiler for memory profiling, stackprof for CPU profiling, rbspy for production profiling without restart, Sentry error tracking (capture_exception, release tracking, traces_sample_rate), N+1 detection in production via strict_loading and SQL log analysis, the four golden signals (p99 latency, req/s, error rate, saturation), SLI/SLO/SLA for Rails apps, and the blameless post-mortem format.
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