use-structured-logging

Summary

Adhere to Structured Logging. Output logs as machine-readable JSON, not as plain text. Ensure every log entry includes a TraceID and SpanID propagated from the request context to enable distributed tracing.

Rationale

• Machine Parseability: Log aggregation systems (Datadog, CloudWatch, ELK) can index JSON fields efficiently, allowing queries like env:prod status:500 user_id:123.
• Distributed Tracing: Without a TraceID, it is impossible to correlate logs across multiple microservices for a single request.
• Consistency: Standardized fields (level, message, timestamp) make dashboards reliable.