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‎docs/FOUNDATION_DOCS_OTP_NOW/11_githubCopilotSonnet4_TODO.md‎

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# ElixirScope Foundation Infrastructure - Missing Features TODO
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## Overview
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This document details the **missing 15%** of infrastructure features identified in the ElixirScope Foundation implementation analysis. While the core infrastructure is 85% complete with all critical protection patterns implemented, several advanced monitoring and AOP features remain unimplemented.
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**Current Implementation Status: 85% Complete**
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- ✅ Core Protection Patterns (Circuit Breaker, Rate Limiter, Connection Pooling)
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- ✅ Unified Infrastructure Facade
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- ✅ Superior Registry Architecture
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- ✅ Full Foundation Integration
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- ❌ Custom Monitoring Services (Missing 15%)
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---
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## 1. Custom Infrastructure Services - NOT IMPLEMENTED (0%)
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### 1.1 PerformanceMonitor Service ❌
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**Status**: Design exists in docs but not implemented in actual codebase
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**Documentation References**:
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- `docs/FOUNDATION_OTP_IMPLEMENT_NOW/infrastructure/performance_monitor.ex` (complete design)
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- `docs/FOUNDATION_OTP_IMPLEMENT_NOW/10_gemini_plan.md` (architectural overview)
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**Detailed Design Found**:
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```elixir
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# Full GenServer implementation design exists with:
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- Module: ElixirScope.Foundation.Infrastructure.PerformanceMonitor
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- Metric Types: :latency, :throughput, :error_rate, :resource_usage
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- API Methods: record_latency/4, record_throughput/4, record_error_rate/4
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- Performance Analysis: get_performance_summary/3, get_baseline/2
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- Alerting: set_alert_threshold/4, check_performance_health/2
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- Time Windows: :minute, :hour, :day with aggregations (:avg, :p50, :p95, :p99)
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```
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**Missing Implementation Features**:
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- GenServer for metric collection and aggregation
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- Baseline performance calculation algorithms
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- Performance alerting system with threshold monitoring
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- Integration with telemetry events from other infrastructure components
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- Retention and cleanup of historical performance data
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- REST/HTTP endpoint exposure for metrics
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**Integration Points** (from docs):
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- Circuit Breakers, Rate Limiters, Connection Pools send metrics
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- Infrastructure facade calls `record_operation_success/failure`
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- Example usage: `PerformanceMonitor.record_latency(namespace, [:foundation, :config, :get], 1500, %{cache: :miss})`
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### 1.2 MemoryManager Service ❌
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**Status**: Design exists in docs but not implemented in actual codebase
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**Documentation References**:
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- `docs/FOUNDATION_OTP_IMPLEMENT_NOW/infrastructure/memory_manager.ex` (complete design)
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- `docs/FOUNDATION_OTP_IMPLEMENT_NOW/infrastructure.ex` (integration examples)
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**Detailed Design Found**:
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```elixir
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# Full GenServer implementation design exists with:
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- Module: ElixirScope.Foundation.Infrastructure.MemoryManager
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- Pressure Levels: :low, :medium, :high, :critical
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- API Methods: check_pressure/1, request_cleanup/3, get_stats/1
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- Memory Stats: total_memory, process_memory, system_memory, threshold_percentage
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- Cleanup Strategies: Configurable cleanup modules implementing MemoryCleanup behaviour
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```
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**Missing Implementation Features**:
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- GenServer for continuous memory monitoring
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- Pressure level detection algorithms based on configurable thresholds
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- Cleanup strategy framework with behaviour definition
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- Integration with Infrastructure facade for memory pressure checks
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- Automatic cleanup triggering when pressure levels exceed thresholds
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- Memory usage tracking and historical analysis
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**Integration Points** (from docs):
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- Infrastructure facade checks memory pressure before operations
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- Example: `check_memory_pressure(namespace)` returns `:critical` → `:error, :memory_pressure_critical`
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- Cleanup strategies for: EventStore, ConfigCache, TelemetryService
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- Configurable cleanup with priority levels
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### 1.3 HealthAggregator Service ❌
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**Status**: Partial design exists in docs but not implemented in actual codebase
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**Documentation References**:
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- `docs/FOUNDATION_OTP_IMPLEMENT_NOW/infrastructure/health_check.ex` (partial design)
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- `docs/docs20250602/FOUNDATION_OTP_IMPLEMENT_NOW.md` (HTTP integration)
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**Detailed Design Found**:
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```elixir
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# Partial GenServer implementation design exists with:
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- Module: ElixirScope.Foundation.Infrastructure.HealthAggregator
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- Health Status: :healthy, :degraded, :unhealthy
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- API Methods: system_health/1, quick_system_health/1
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- Integration: Periodic polling of registered services via ServiceRegistry
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```
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**Missing Implementation Features**:
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- Complete GenServer implementation for health aggregation
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- System health scoring algorithms
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- Deep health checks calling specific service health endpoints
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- Health status caching and historical trending
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- HTTP endpoint exposure via HealthEndpoint module
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- Integration with load balancer health checks
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**Integration Points** (from docs):
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- Health check logic exists but aggregation service missing
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- HTTP endpoint design: `ElixirScope.Foundation.Infrastructure.HealthEndpoint`
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- Integration with ServiceRegistry for discovering services to health check
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- JSON format health responses for HTTP endpoints
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---
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## 2. AOP Mixins - PARTIALLY IMPLEMENTED (50%)
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### 2.1 ServiceProtection Mixin ✅ (Design Complete)
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**Status**: Complete design exists in infrastructure.ex but not extracted as standalone module
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**Documentation References**:
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- `docs/FOUNDATION_OTP_IMPLEMENT_NOW/infrastructure.ex` (lines 354-410)
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**What Exists**:
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```elixir
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# Complete mixin design with:
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defmodule ElixirScope.Foundation.Infrastructure.ServiceProtection do
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# Macro for automatic protection integration
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# @before_compile hook for adding protection methods
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# protected_call/3 for operation protection
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# infrastructure_health_check/0 integration
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# with_infrastructure_protection/2 macro for declarative protection
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end
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```
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**Missing Implementation**:
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- Extract as standalone module file
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- Add to actual codebase (currently only in docs)
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- Integration examples and documentation
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- Testing and validation
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### 2.2 ServiceInstrumentation Mixin ✅ (Design Complete)
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**Status**: Complete design exists in performance_monitor.ex but not extracted as standalone module
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**Documentation References**:
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- `docs/FOUNDATION_OTP_IMPLEMENT_NOW/infrastructure/performance_monitor.ex` (lines 545-616)
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- `docs/docs20250602/FOUNDATION_OTP_IMPLEMENT_NOW.md` (usage examples)
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**What Exists**:
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```elixir
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# Complete mixin design with:
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defmodule ElixirScope.Foundation.Infrastructure.ServiceInstrumentation do
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# Macro for automatic performance instrumentation
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# @before_compile hook for adding instrumentation
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# Automatic telemetry event emission
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# Performance metric collection integration
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end
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```
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**Missing Implementation**:
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- Extract as standalone module file
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- Add to actual codebase (currently only in docs)
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- Integration with PerformanceMonitor service
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- Advanced instrumentation features (sampling, conditional instrumentation)
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---
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## 3. Advanced Health Endpoints - NOT IMPLEMENTED (0%)
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### 3.1 HTTP Health Endpoint Integration ❌
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**Documentation References**:
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- `docs/FOUNDATION_OTP_IMPLEMENT_NOW/infrastructure/health_check.ex` (lines 504-586)
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- `docs/docs20250602/FOUNDATION_OTP_IMPLEMENT_NOW.md` (HTTP integration section)
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**Missing Features**:
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```elixir
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# Design exists for:
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defmodule ElixirScope.Foundation.Infrastructure.HealthEndpoint do
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# HTTP-compatible health check endpoint integration
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# get_health_json/1 - JSON format for HTTP endpoints
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# get_quick_health/1 - Quick health for load balancer endpoints
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# Integration with HealthAggregator service
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end
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```
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**Implementation Requirements**:
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- HTTP endpoint implementation (likely Phoenix or Plug-based)
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- JSON response formatting for health status
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- Quick health checks for load balancers (simple OK/NOT_OK)
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- Deep health checks with detailed service status
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- Integration with external monitoring systems
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---
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## 4. Implementation Priority and Effort Estimates
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### Priority 1 - Core Missing Services (High Value)
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1. **PerformanceMonitor Service** - ~3-4 days
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- Critical for production monitoring and alerting
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- Required for performance baseline establishment
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2. **MemoryManager Service** - ~2-3 days
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- Important for AST layer memory management
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- Prevents OOM conditions in production
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### Priority 2 - Health and Monitoring (Medium Value)
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3. **HealthAggregator Service** - ~2-3 days
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- Completes the health monitoring ecosystem
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- Enables comprehensive system health visibility
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4. **HTTP Health Endpoints** - ~1-2 days
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- Required for production deployment and monitoring
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- Integrates with external monitoring systems
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### Priority 3 - Developer Experience (Lower Value)
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5. **Extract AOP Mixins** - ~1 day
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- Improves developer ergonomics
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- Enables declarative protection patterns
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**Total Estimated Effort**: 9-13 days to achieve 100% implementation
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---
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## 5. Recommended Implementation Order
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1. **PerformanceMonitor Service** - Highest impact, enables monitoring of existing infrastructure
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2. **MemoryManager Service** - Critical for stability, especially with AST layer planned
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3. **HealthAggregator Service** - Completes the monitoring triangle with Performance + Memory
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4. **HTTP Health Endpoints** - Enables production deployment readiness
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5. **Extract AOP Mixins** - Developer experience improvement
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---
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## 6. Architecture Decisions Needed
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### 6.1 HTTP Framework Choice
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- **Decision Required**: Choose between Phoenix (full framework) vs Plug (lightweight) for health endpoints
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- **Recommendation**: Plug-based for minimal overhead since these are infrastructure endpoints
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### 6.2 Metrics Storage
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- **Decision Required**: Choose storage backend for PerformanceMonitor metrics
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- **Options**: ETS (in-memory), external time-series DB, or hybrid approach
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- **Recommendation**: Start with ETS + periodic persistence for simplicity
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### 6.3 Memory Management Strategy
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- **Decision Required**: Define memory cleanup strategies and their priorities
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- **Recommendation**: Implement pluggable cleanup behaviours for flexibility
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---
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## 7. Success Criteria for 100% Implementation
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- [ ] All 3 custom infrastructure services implemented and tested
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- [ ] AOP mixins extracted and integrated into Foundation services
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- [ ] HTTP health endpoints responding correctly
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- [ ] Full telemetry integration across all components
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- [ ] Production-ready monitoring and alerting capabilities
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- [ ] Memory management preventing OOM conditions
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- [ ] Performance baselines and alerting functional
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**Target**: Move from 85% → 100% implementation, completing the ElixirScope Foundation Infrastructure layer as a production-ready, enterprise-grade system.

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