Log Reading & Analysis

Logs are the primary communication channel between your systems and you. But reading logs is a skill — not just pattern recognition. These exercises train you to decode log structure, extract signal from noise, identify errors quickly, and communicate findings clearly in English.

Intermediate 5 exercises

Reading JSON Logs

Decode structured log entries: timestamp, level, traceId, message, and context fields. Learn what each field tells you during an incident.
Intermediate 5 exercises

Reading Stack Traces

Identify the root exception, trace call chains, and extract the relevant error frame from Python, Java, and Node.js stack traces.
Beginner 5 exercises

HTTP & API Error Logs

4xx vs 5xx status codes, upstream timeouts, rate limiting logs, and decoding nginx/Apache/ELB access log formats.
Advanced 5 exercises

Incident Log Analysis

Reconstruct incident timelines from log evidence. Write incident update messages using log data. Correlate events across services.