eng-logging

Structured logging requires selecting logger.error, logger.warn, logger.info, or logger.debug by investigation threshold, while emitting consistent context fields like requestId, userId, operation, duration, and error so logs are searchable and correlate to real alerts.

To prevent noisy logs, avoid logging every success or expected 404s as errors, and eliminate duplicate error logging across different application layers like controllers, middleware, and workers to ensure only actionable signals remain.

To redact PII and secrets from application logs, avoid logging sensitive payment, health, session identifiers, or personal data entirely, and apply redaction or masking techniques when emitting structured context fields.

Use logger.error, logger.warn, logger.info, and logger.debug based on the human investigation threshold required, ensuring that alerts mapped to these log levels correspond directly to real operational needs across your code paths.

Yes, structured logging applies to service methods, controllers, handlers, workers, and middleware by emitting context fields like operation and duration for background jobs, retries, and failures to ensure end-to-end observability.