Update all documentation with Phase 3 completion

📝 **DEVELOPMENT_PLAN.md**:
- Marked Phase 3 as complete with comprehensive summary
- Updated success metrics to reflect monitoring engine capabilities
- Added detailed implementation notes for OutageDetectionService, ProbeService, DiscoveryService

📝 **README.md**:
- Updated v1.0 scope with completed monitoring features
- Added monitoring capabilities section with implementation status
- Updated API endpoints section with monitoring test endpoints
- Enhanced monitoring capabilities with flap damping and state management details

📝 **docs/README.md**:
- Added monitoring engine to completed implementations
- Updated API documentation with operational status
- Added background processing and state management to completed features

📝 **ONE_PAGER.MD**:
- Added comprehensive "Implementation Status" section (new Section 20)
- Documented Phase 0-3 completion with detailed capabilities
- Listed current operational features and next phase readiness
- Updated section numbering for subsequent sections

**Status Update**: Phase 3 monitoring engine is fully operational with:
✅ Real-time ICMP, TCP, HTTP probes
✅ Flap damping with 2/2 thresholds
✅ Outage detection and state management
✅ Background processing with concurrency control
✅ Database persistence and EF Core integration
✅ CIDR/wildcard target expansion
✅ Live testing verified with sample endpoints

Ready for Phase 4 (API Implementation) or Phase 5 (Background Jobs).

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: hemanandr

DEVELOPMENT_PLAN.md

@@ -91,14 +91,22 @@ You can effectively work on **up to 6 parallel worktrees** without conflicts:
 - Settings service with memory caching and watermark tracking
 - Database migrations and entities match documented data model exactly
 
-### PHASE 3: Monitoring Engine (Week 2, Days 1-3)
+### PHASE 3: Monitoring Engine (Week 2, Days 1-3) ✅ **COMPLETE**
 **Core monitoring functionality**
 
 | Issue | Priority | Time | Description | Worktree | Status |
 |-------|----------|------|-------------|----------|---------|
-| #26 | P1 | 1d | Outage detection service | 3 | 🔓 **UNLOCKED** |
-| SEC-06 | P1 | 4-6h | Discovery & expansion logic | 3 | 🔓 **UNLOCKED** |
-| ENV-14 | P1 | 3-4h | Concurrency caps implementation | 3 | 🔓 **UNLOCKED** |
+| #26 | P1 | 1d | Outage detection service | 3 | ✅ **COMPLETE** - Commit b5d1415 |
+| SEC-06 | P1 | 4-6h | Discovery & expansion logic | 3 | ✅ **COMPLETE** - Commit b5d1415 |
+| ENV-14 | P1 | 3-4h | Concurrency caps implementation | 3 | ✅ **COMPLETE** - Commit b5d1415 |
+
+**Phase 3 Summary**: Complete monitoring engine with real-time probe execution:
+- OutageDetectionService with 2/2 flap damping and state transitions
+- ProbeService supporting ICMP, TCP, and HTTP/HTTPS protocols
+- DiscoveryService for CIDR, wildcard, and hostname expansion  
+- MonitoringBackgroundService with semaphore-controlled concurrency (100 max)
+- Continuous endpoint monitoring with database persistence
+- Successfully tested with live endpoints and verified state management
 
 ### PHASE 4: API Implementation (Week 2, Days 3-5)
 **REST endpoints - EPIC #6**
@@ -217,7 +225,7 @@ git worktree remove ../pulse-env-setup
 - **Phase 0**: ✅ **COMPLETE** - Dev can run `dotnet build` successfully
 - **Phase 1**: All specs frozen, no more contract changes
 - **Phase 2**: ✅ **COMPLETE** - Database created, migrations run, config storage & settings implemented with full testing
-- **Phase 3**: Can detect UP/DOWN state changes
+- **Phase 3**: ✅ **COMPLETE** - Can detect UP/DOWN state changes with continuous monitoring, outage tracking, and concurrent probe execution
 - **Phase 4**: All API endpoints return data (mock or real)
 - **Phase 5**: Rollups computed automatically
 - **Phase 6**: UI loads, shows live status

ONE_PAGER.MD

@@ -333,7 +333,52 @@ targets:
 
 ---
 
-## 20) Adoption & Success Metrics
+## 20) Implementation Status (Current Progress) ✅
+
+### **Phase 0-3 Complete** (Foundation through Monitoring Engine)
+
+#### **✅ Data Layer (Phase 2)**
+- EF Core entities with SQLite provider configured
+- Database migrations for all tables (endpoints, check_result_raw, outages, rollups, etc.)
+- ConfigVersion storage with SHA-256 hash-based duplicate detection
+- Settings service with memory caching and watermark tracking for rollups
+
+#### **✅ Configuration Management**  
+- YAML parsing with YamlDotNet and JSON Schema validation
+- POST /api/config/apply endpoint with diff preview and version snapshots
+- GET /api/config/versions and GET /api/config/versions/{id} endpoints
+- Configuration versioning and restore capabilities tested and operational
+
+#### **✅ Monitoring Engine (Phase 3)**
+- **OutageDetectionService**: 2/2 flap damping thresholds with per-endpoint state tracking
+- **ProbeService**: ICMP ping, TCP connect, HTTP/HTTPS checks with timeout/retry logic
+- **DiscoveryService**: CIDR range expansion ("10.0.0.0/24"), wildcard expansion ("10.0.0.*"), hostname resolution
+- **MonitoringBackgroundService**: Continuous monitoring with semaphore-controlled concurrency (100 max)
+- Real-time probe execution, outage detection, and database persistence operational
+
+#### **📊 Current Capabilities**
+- ✅ All probe types (ICMP, TCP, HTTP) functional with proper error handling
+- ✅ Background service monitors endpoints with configurable intervals
+- ✅ State transitions and outage records automatically created/closed
+- ✅ Raw check results persisted to database with proper EF Core integration
+- ✅ Tested with live endpoints (Cloudflare DNS, Google Search) - monitoring operational
+
+#### **🚧 Next Phase Ready**
+- Phase 4: API Implementation (GET /api/status/live, history endpoints)
+- Phase 5: Background Jobs (15-minute and daily rollups)
+- Phase 6: Frontend (React UI for live board, endpoint detail, history views)
+
+### **Deployment Status**
+- ASP.NET Core server operational on localhost:8080
+- Database created and seeded with sample data  
+- Windows service hosting ready for implementation
+- Test endpoints available for monitoring engine validation
+
+**Implementation Confidence:** 0.9
+
+---
+
+## 21) Adoption & Success Metrics
 
 * **Install completion rate** (service up within 5 minutes).
 * **Active monitored endpoints** count distribution.
@@ -344,7 +389,7 @@ targets:
 
 ---
 
-## 21) Key Decisions — Rationale & Confidence (Quick Table)
+## 22) Key Decisions — Rationale & Confidence (Quick Table)
 
 | Area             | Decision                      | Rationale                                   | Confidence |
 | ---------------- | ----------------------------- | ------------------------------------------- | ---------- |
@@ -360,7 +405,7 @@ targets:
 
 ---
 
-## 22) Near‑Term Work Products (for the next steps)
+## 23) Near‑Term Work Products (for the next steps)
 
 * YAML **JSON Schema** + sample configs (hosts, wildcard, CIDR).
 * **ERD** and EF Core entity set (+ provider switch notes).

README.md

@@ -68,9 +68,16 @@ GET /api/config/versions/{id}
 # Settings management (internal)
 GET /api/settings/{key}
 POST /api/settings/{key}
+
+# Monitoring test endpoints (development)
+POST /api/test/monitoring/test-probes
+POST /api/test/monitoring/test-outage-detection
+POST /api/test/monitoring/test-discovery
+GET /api/test/monitoring/check-results
+GET /api/test/monitoring/outages
 ```
 
-**Status**: Configuration management endpoints are fully implemented and tested. Settings service provides watermark tracking for rollup jobs.
+**Status**: Configuration management endpoints are fully implemented and tested. Settings service provides watermark tracking for rollup jobs. Monitoring engine is operational with continuous background probing and outage detection.
 
 ## Development
 
@@ -100,21 +107,25 @@ POST /api/settings/{key}
 ## Features
 
 ### v1.0 Scope
-- **Network Monitoring**: ICMP ping, TCP connect, HTTP status checks
+- **Network Monitoring**: ✅ ICMP ping, TCP connect, HTTP status checks with concurrent execution
 - **Configuration**: ✅ YAML-based with JSON Schema validation and version tracking
 - **Data Storage**: ✅ SQLite with automatic rollups and retention foundation
 - **Web Interface**: Real-time status dashboard and historical views
 - **Configuration Management**: ✅ Apply, list, and download configuration versions
 - **Settings Management**: ✅ Key-value store with watermark tracking for rollup jobs
-- **Alerting**: Status change detection with flap damping
+- **Alerting**: ✅ Status change detection with flap damping (2/2 thresholds)
+- **Outage Tracking**: ✅ Automatic outage detection with start/end timestamps
+- **Target Discovery**: ✅ CIDR range and wildcard expansion from configuration
 - **Deployment**: Single Windows service installer
 
 ### Monitoring Capabilities
-- **Device Discovery**: CIDR range and wildcard expansion
-- **Probe Types**: ICMP, TCP port checks, HTTP/HTTPS requests
-- **Status Logic**: 2 failures → DOWN, 2 successes → UP
-- **Data Retention**: Raw data (60 days), rollups (indefinite)
-- **Performance**: 100 concurrent probes, 5s timeout, 2 retries
+- **Device Discovery**: ✅ CIDR range and wildcard expansion (e.g., "10.0.0.0/24", "192.168.1.*")
+- **Probe Types**: ✅ ICMP ping, TCP port checks, HTTP/HTTPS requests with content matching
+- **Status Logic**: ✅ 2 failures → DOWN, 2 successes → UP (flap damping)
+- **Background Processing**: ✅ Continuous monitoring with configurable intervals per endpoint
+- **Data Retention**: Raw data (60 days), rollups (indefinite) 
+- **Performance**: ✅ 100 concurrent probes, configurable timeouts, retry logic
+- **State Management**: ✅ Per-endpoint success/fail streak tracking with outage detection
 
 ## Getting Help
 

docs/README.md

@@ -15,9 +15,11 @@ The OpenAPI specification defines all REST endpoints:
 - `GET /api/status/live` - Current status of all monitored endpoints
 - `GET /api/endpoints/{id}` - Detailed endpoint information
 - `GET /api/history/endpoint/{id}` - Historical status data
-- `POST /api/config/apply` - Apply new monitoring configuration
-- `GET /api/config/versions` - List all configuration versions
-- `GET /api/config/versions/{id}` - Download specific configuration version
+- `POST /api/config/apply` - ✅ Apply new monitoring configuration
+- `GET /api/config/versions` - ✅ List all configuration versions
+- `GET /api/config/versions/{id}` - ✅ Download specific configuration version
+
+**Monitoring Engine**: Operational with real-time probe execution, outage detection, and database persistence.
 
 ## Configuration Format
 
@@ -41,6 +43,9 @@ Entity Framework Core entities define the database structure:
 - **Data Layer**: EF Core entities, migrations, SQLite configuration
 - **Configuration Management**: Apply, versions, download endpoints with full testing
 - **Settings Service**: Key-value store with memory caching and watermark methods
+- **Monitoring Engine**: Complete probe services (ICMP, TCP, HTTP) with outage detection
+- **Background Processing**: Continuous endpoint monitoring with concurrency control
+- **State Management**: Flap damping and per-endpoint state tracking with database persistence
 
 ### Specifications
 All specifications are **frozen** for v1 development. Changes require architectural review.