structured-log-contracts

Structured logging with trace propagation is implemented by defining an immutable JSON schema and using AsyncLocalStorage to pass trace_id and span_id automatically across microservices without manual parameter passing.

Sanitizing PII in structured log payloads is handled by applying sanitization rules during payload construction, ensuring sensitive data is masked and payload sizes are limited to prevent leakage and avoid performance degradation.

Handling structured logging failures involves using a safe serialization fallback to generate a valid payload if the primary serialization fails, and a resilient I/O fallback to prevent application crashes when the log destination is unavailable.

Yes, the structured logging contract supports Python microservices by utilizing ContextVar for trace context propagation, offering the same immutable JSON payload guarantees and fault-tolerant I/O as the Node.js implementation.

An immutable contract schema for observability logs guarantees that mandatory fields like timestamp, level, message, service, and trace_id remain consistent, ensuring reliable end-to-end traceability and preventing runtime payload mutations.