Log Analysis

When you're staring at a wall of application logs trying to figure out why something broke at 3am, this walks you through structured logging patterns that actually parse well. It covers when to use different log levels, setting up JSON formatted logs for tools like Elasticsearch, and includes practical query examples for common debugging scenarios. The emphasis on structured over unstructured logging is spot on, because grep only gets you so far when you need to correlate events across distributed services. Includes references for log aggregation tools and patterns for security incidents, performance issues, and user action auditing.