- feat(logging): implement structured logging, metrics, and error mon…

[Cedarich]

Closes #44

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Summary

Implement comprehensive logging and monitoring across the PropChain backend to improve observability, debuggability, and production readiness.

Changes

• Implement structured logging with correlation and trace IDs

  • Use CLS-based context for correlationId and traceId
  • Attach x-correlation-id and x-trace-id headers in LoggingMiddleware
  • Ensure all logs include correlation/trace IDs via StructuredLoggerService

• Add log aggregation, centralization, and rotation

  • Centralize Winston configuration with JSON logs and sensitive data redaction
  • Configure console + daily-rotated file transports for error and application logs
  • Define rotation and retention (maxFiles, maxSize, zipped archives)

• Implement performance monitoring and metrics

  • Introduce MetricsService to track HTTP request counts, durations, and status codes
  • Wire metrics into the HTTP LoggingInterceptor
  • Expose GET /health/metrics for metrics snapshot

• Add error tracking and alerting hooks

  • Add ErrorMonitoringService as a central place to capture exceptions
  • Update AllExceptionsFilter to:
    • Use structured logging with request/correlation/trace IDs
    • Record error metrics
    • Provide a single integration point for future alerting (Slack/email/etc.)

• Implement lightweight distributed tracing

  • Manage traceId alongside correlationId in the CLS namespace
  • Propagate x-correlation-id and x-trace-id to outbound valuation API calls
  • Include trace context in all logs for easier end-to-end correlation

• Integrate logging and monitoring globally

  • Make LoggingModule global and export logger/metrics/error-monitoring services
  • Register LoggingInterceptor and AllExceptionsFilter as global providers
  • Use StructuredLoggerService as the Nest logger in main.ts

Acceptance Criteria Mapping

• Implement structured logging with correlation IDs
• Add log aggregation and centralization
• Implement performance monitoring and metrics
• Add error tracking and alerting hooks (integration point ready)
• Implement distributed tracing (correlation/trace IDs + propagation)
• Add log retention and rotation policies

Notes

• npm run lint passes (TypeScript version warning only).
• npm run test:unit currently fails due to Jest coverageThreshold JSON parsing (pre-existing quoting issue on Windows).

close issue #44

[Cedarich]

Please approve workflow

[LaGodxy]

@Cedarich fix CI