Observability Engineering in Production Systems: Structured Logging, Metrics, and Distributed Tracing at Scale

Based on the provided content, here are key points and best practices for logging in software systems:

Standard Log Shape

1. Level: Each log entry should have a level (debug, info, warn, error, fatal).
2. Timestamp: Use ISO 8601 format.
3. Service: Identify which service emitted the log.
4. Event: Use namespaced event identifiers (e.g., payment.webhook.received).
5. Request ID: Useful for tracing HTTP requests and queue-processor events.
6. User ID: Include if the request is user-scoped.
7. Tenant ID: For multi-tenant systems like Festease.
8. Environment: Automatically injected by customProps on HTTP requests.
9. Host: Automatically injected by customProps on HTTP requests.
10. Duration: Time taken for an operation in milliseconds.
11. Message: Human-readable summary of the log entry.
12. Contextual Data: Domain-specific data like reference, amount, etc.

Best Practices

1. Use Structured Logging:
   • Use JSON format to ensure logs are machine-readable and easily parsed by tools like Logstash or

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