Health Monitoring Architecture

Requirements and Dataflow

Core Requirements

  • Comprehensive system health monitoring with multi-component assessment
  • Real-time health check orchestration with configurable intervals
  • Deep system monitoring including memory, CPU, and disk utilization
  • External dependency health verification and circuit breaker integration
  • Database connection pool monitoring with performance thresholds
  • Application-level health metrics with business logic validation

Data Flow Patterns

  1. Health Check Cycle: Periodic Timer → Component Checks → Status Aggregation → Health Report
  2. Deep Monitoring: System Resource Collection → Performance Analysis → Threshold Evaluation → Alert Generation
  3. Dependency Verification: External API Calls → Response Time Measurement → Status Determination → Circuit Breaker Update
  4. Database Health: Connection Pool Analysis → Query Performance Check → Resource Utilization → Health Score
  5. Application Health: Business Logic Validation → Feature Availability Check → Service Status → Overall Health

High-level Purpose and Responsibilities

Primary Purpose

Provides a comprehensive health monitoring system that continuously assesses system components, external dependencies, and application-level functionality to ensure optimal service availability and performance.

Core Responsibilities

  • System Health Assessment: Real-time monitoring of memory, CPU, disk, and network resources
  • Component Health Verification: Individual component health checks with status aggregation
  • External Dependency Monitoring: Third-party service availability and performance tracking
  • Database Health Analysis: Connection pool utilization and query performance monitoring
  • Application Health Validation: Business logic health checks and feature availability assessment
  • Alert Management: Threshold-based alerting with severity classification and escalation

Key Abstractions and Interfaces

Core Health Monitoring

  • EnhancedSystemHealth: Comprehensive system health report with detailed component status
  • ComponentStatus: Individual component health with response time and error tracking
  • HealthStatus: Healthy, Degraded, Unhealthy status enumeration with clear semantics
  • HealthCheckFunction: Pluggable health check interface for extensible monitoring

System Resource Monitoring

  • DatabasePoolStats: Connection pool utilization with performance metrics
  • DiskUsageStats: File system monitoring with capacity and utilization tracking
  • ApplicationHealthMetrics: Application-specific health indicators and thresholds
  • CircuitBreakerHealth: Circuit breaker status with failure rate and recovery tracking

Alert and Notification

  • HealthAlert: Health-specific alert with component context and remediation guidance
  • HealthTrend: Historical health trend analysis with predictive indicators
  • MaintenanceWindow: Planned maintenance coordination with health check suspension
  • HealthDashboard: Unified health visualization with status aggregation

Data Transformations and Flow

System Health Collection

Resource Polling → Metric Collection → Threshold Analysis → Status Determination → Health Report

Component Health Aggregation

Individual Checks → Status Collection → Dependency Analysis → Overall Health → Dashboard Update

Alert Generation Process

Health Assessment → Threshold Comparison → Alert Creation → Severity Assignment → Notification Dispatch

External Dependency Monitoring

Service Calls → Response Time Measurement → Availability Check → Circuit Breaker Update → Health Status

Dependencies and Interactions

External Dependencies

  • axum: HTTP framework integration for health check endpoints
  • chrono: Timestamp management for health check intervals and trend analysis
  • serde: JSON serialization for health reports and dashboard integration
  • std::collections: HashMap for component status tracking and aggregation
  • tracing: Structured logging integration with health check context

Internal System Interactions

  • State Management: Integration with application state for component health checks
  • Database Layer: Connection pool monitoring and query performance assessment
  • Monitoring System: Integration with global metrics for unified observability
  • Alert System: Health-based alert generation and notification dispatch
  • Circuit Breaker: Health status integration with failure detection and recovery

Architectural Patterns

Pluggable Health Check Framework

  • Extensible health check registration system
  • Component-specific health check implementations
  • Async-friendly health check execution with timeout handling
  • Hierarchical health status aggregation with dependency mapping

Resource Monitoring Integration

  • System resource monitoring with platform-specific implementations
  • Memory usage tracking with garbage collection impact assessment
  • CPU utilization monitoring with load average analysis
  • Disk space monitoring with threshold-based alerting

Circuit Breaker Integration

  • Health-aware circuit breaker state management
  • Failure rate calculation with health impact assessment
  • Recovery monitoring with health check integration
  • Graceful degradation based on health status

Dashboard and Alerting

  • Real-time health dashboard with component status visualization
  • Configurable alert thresholds with environment-specific tuning
  • Health trend analysis with predictive failure detection
  • Maintenance window coordination with health check suspension

Performance Optimization

  • Efficient health check scheduling with minimal resource impact
  • Cached health status with configurable TTL for performance
  • Batch health check execution with parallel processing
  • Resource usage optimization for continuous monitoring scenarios