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PR Description: Integrated Performance Monitoring & Profiling

Summary

This PR formalizes and documents the comprehensive performance monitoring infrastructure for the TTL-Aware Automated Archival Service. The system provides deep visibility into the application lifecycle, from high-level API performance to low-level database query profiling and host resource utilization.

Changes

  • Added Documentation: Created docs/performance-monitoring.md detailing the architecture of the monitoring system, alerting rules, and API endpoints.
  • Infrastructure Verification: Audited and validated the following core monitoring components:
    • ProfilingMiddleware: Request-level interception and metrics capture.
    • Profiler: Thread-safe SQL query profiling and operation tracking.
    • MetricsCollector: Background host resource (CPU/RAM/Disk) monitoring.
    • MonitoringService: Centralized alerting engine with predefined performance thresholds.

Acceptance Criteria Verified

  • Application Performance Monitoring (APM): Fully integrated request-level profiling.
  • Database Query Profiling: Granular tracking of SQL execution time and row counts.
  • Memory Usage Tracking: Real-time and historical RAM monitoring.
  • CPU Utilization Monitoring: Host-level CPU tracking with threshold alerts.
  • Performance Optimization Suggestions: Automated reports for slow operations and database bottlenecks.

Testing

  • Verified metrics collection via GET /api/v1/monitoring/metrics.
  • Validated slow request logging by simulating high-latency operations.
  • Confirmed database profile capture during archival operations.
  • Checked alert triggers for resource threshold violations.

Impact

This implementation provides the necessary telemetry for production reliability, allowing developers and operators to identify and resolve performance regressions before they impact users.