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| 1 | +# NLWebNet Monitoring and Observability Demo |
| 2 | + |
| 3 | +This document demonstrates the production-ready monitoring and observability features implemented in NLWebNet. |
| 4 | + |
| 5 | +## Features Implemented |
| 6 | + |
| 7 | +### Health Checks |
| 8 | + |
| 9 | +The library now includes comprehensive health checks accessible via REST endpoints: |
| 10 | + |
| 11 | +#### Basic Health Check |
| 12 | +``` |
| 13 | +GET /health |
| 14 | +``` |
| 15 | + |
| 16 | +Returns basic health status: |
| 17 | +```json |
| 18 | +{ |
| 19 | + "status": "Healthy", |
| 20 | + "totalDuration": "00:00:00.0123456" |
| 21 | +} |
| 22 | +``` |
| 23 | + |
| 24 | +#### Detailed Health Check |
| 25 | +``` |
| 26 | +GET /health/detailed |
| 27 | +``` |
| 28 | + |
| 29 | +Returns detailed status of all services: |
| 30 | +```json |
| 31 | +{ |
| 32 | + "status": "Healthy", |
| 33 | + "totalDuration": "00:00:00.0234567", |
| 34 | + "entries": { |
| 35 | + "nlweb": { |
| 36 | + "status": "Healthy", |
| 37 | + "description": "NLWeb service is operational", |
| 38 | + "duration": "00:00:00.0012345" |
| 39 | + }, |
| 40 | + "data-backend": { |
| 41 | + "status": "Healthy", |
| 42 | + "description": "Data backend (MockDataBackend) is operational", |
| 43 | + "duration": "00:00:00.0098765" |
| 44 | + }, |
| 45 | + "ai-service": { |
| 46 | + "status": "Healthy", |
| 47 | + "description": "AI/MCP service is operational", |
| 48 | + "duration": "00:00:00.0087654" |
| 49 | + } |
| 50 | + } |
| 51 | +} |
| 52 | +``` |
| 53 | + |
| 54 | +### Metrics Collection |
| 55 | + |
| 56 | +The library automatically collects comprehensive metrics using .NET 9 built-in metrics: |
| 57 | + |
| 58 | +#### Request Metrics |
| 59 | +- `nlweb.requests.total` - Total number of requests processed |
| 60 | +- `nlweb.request.duration` - Duration of request processing in milliseconds |
| 61 | +- `nlweb.requests.errors` - Total number of request errors |
| 62 | + |
| 63 | +#### AI Service Metrics |
| 64 | +- `nlweb.ai.calls.total` - Total number of AI service calls |
| 65 | +- `nlweb.ai.duration` - Duration of AI service calls in milliseconds |
| 66 | +- `nlweb.ai.errors` - Total number of AI service errors |
| 67 | + |
| 68 | +#### Data Backend Metrics |
| 69 | +- `nlweb.data.queries.total` - Total number of data backend queries |
| 70 | +- `nlweb.data.duration` - Duration of data backend operations in milliseconds |
| 71 | +- `nlweb.data.errors` - Total number of data backend errors |
| 72 | + |
| 73 | +#### Health Check Metrics |
| 74 | +- `nlweb.health.checks.total` - Total number of health check executions |
| 75 | +- `nlweb.health.failures` - Total number of health check failures |
| 76 | + |
| 77 | +#### Business Metrics |
| 78 | +- `nlweb.queries.by_type` - Count of queries by type (List, Summarize, Generate) |
| 79 | +- `nlweb.queries.complexity` - Query complexity score based on length and structure |
| 80 | + |
| 81 | +### Rate Limiting |
| 82 | + |
| 83 | +Configurable rate limiting with multiple strategies: |
| 84 | + |
| 85 | +#### Default Configuration |
| 86 | +- 100 requests per minute per client |
| 87 | +- IP-based identification by default |
| 88 | +- Optional client ID-based limiting via `X-Client-Id` header |
| 89 | + |
| 90 | +#### Rate Limit Headers |
| 91 | +All responses include rate limit information: |
| 92 | +``` |
| 93 | +X-RateLimit-Limit: 100 |
| 94 | +X-RateLimit-Remaining: 95 |
| 95 | +X-RateLimit-Reset: 45 |
| 96 | +``` |
| 97 | + |
| 98 | +#### Rate Limit Exceeded Response |
| 99 | +When limits are exceeded, returns HTTP 429: |
| 100 | +```json |
| 101 | +{ |
| 102 | + "error": "rate_limit_exceeded", |
| 103 | + "message": "Rate limit exceeded. Maximum 100 requests per 1 minute(s).", |
| 104 | + "retry_after_seconds": 45 |
| 105 | +} |
| 106 | +``` |
| 107 | + |
| 108 | +### Structured Logging |
| 109 | + |
| 110 | +Enhanced logging with correlation IDs and structured data: |
| 111 | + |
| 112 | +#### Correlation ID Tracking |
| 113 | +- Automatic correlation ID generation for each request |
| 114 | +- Correlation ID included in all log entries |
| 115 | +- Exposed via `X-Correlation-ID` response header |
| 116 | + |
| 117 | +#### Structured Log Data |
| 118 | +Each log entry includes: |
| 119 | +- `CorrelationId` - Unique request identifier |
| 120 | +- `RequestPath` - The request path |
| 121 | +- `RequestMethod` - HTTP method |
| 122 | +- `UserAgent` - Client user agent |
| 123 | +- `RemoteIP` - Client IP address |
| 124 | +- `Timestamp` - ISO 8601 timestamp |
| 125 | + |
| 126 | +## Configuration |
| 127 | + |
| 128 | +### Basic Setup |
| 129 | + |
| 130 | +```csharp |
| 131 | +var builder = WebApplication.CreateBuilder(args); |
| 132 | + |
| 133 | +// Add NLWebNet with monitoring |
| 134 | +builder.Services.AddNLWebNet(options => |
| 135 | +{ |
| 136 | + // Configure rate limiting |
| 137 | + options.RateLimiting.Enabled = true; |
| 138 | + options.RateLimiting.RequestsPerWindow = 100; |
| 139 | + options.RateLimiting.WindowSizeInMinutes = 1; |
| 140 | + options.RateLimiting.EnableIPBasedLimiting = true; |
| 141 | + options.RateLimiting.EnableClientBasedLimiting = false; |
| 142 | +}); |
| 143 | + |
| 144 | +var app = builder.Build(); |
| 145 | + |
| 146 | +// Add NLWebNet middleware (includes rate limiting, metrics, and correlation IDs) |
| 147 | +app.UseNLWebNet(); |
| 148 | + |
| 149 | +// Map NLWebNet endpoints (includes health checks) |
| 150 | +app.MapNLWebNet(); |
| 151 | + |
| 152 | +app.Run(); |
| 153 | +``` |
| 154 | + |
| 155 | +### Advanced Rate Limiting Configuration |
| 156 | + |
| 157 | +```csharp |
| 158 | +builder.Services.AddNLWebNet(options => |
| 159 | +{ |
| 160 | + options.RateLimiting.Enabled = true; |
| 161 | + options.RateLimiting.RequestsPerWindow = 500; // Higher limit |
| 162 | + options.RateLimiting.WindowSizeInMinutes = 5; // 5-minute window |
| 163 | + options.RateLimiting.EnableIPBasedLimiting = false; // Disable IP limiting |
| 164 | + options.RateLimiting.EnableClientBasedLimiting = true; // Enable client ID limiting |
| 165 | + options.RateLimiting.ClientIdHeader = "X-API-Key"; // Custom header |
| 166 | +}); |
| 167 | +``` |
| 168 | + |
| 169 | +### Custom Data Backend with Health Checks |
| 170 | + |
| 171 | +```csharp |
| 172 | +// Register custom data backend - health checks automatically included |
| 173 | +builder.Services.AddNLWebNet<MyCustomDataBackend>(); |
| 174 | +``` |
| 175 | + |
| 176 | +## Monitoring Integration |
| 177 | + |
| 178 | +### Prometheus/Grafana |
| 179 | + |
| 180 | +The built-in .NET metrics can be exported to Prometheus: |
| 181 | + |
| 182 | +```csharp |
| 183 | +builder.Services.AddOpenTelemetry() |
| 184 | + .WithMetrics(builder => |
| 185 | + { |
| 186 | + builder.AddPrometheusExporter(); |
| 187 | + builder.AddMeter("NLWebNet"); // Add NLWebNet metrics |
| 188 | + }); |
| 189 | +``` |
| 190 | + |
| 191 | +### Azure Application Insights |
| 192 | + |
| 193 | +Integrate with Azure Application Insights: |
| 194 | + |
| 195 | +```csharp |
| 196 | +builder.Services.AddApplicationInsightsTelemetry(); |
| 197 | +``` |
| 198 | + |
| 199 | +The structured logging and correlation IDs will automatically be included in Application Insights traces. |
| 200 | + |
| 201 | +## Production Readiness |
| 202 | + |
| 203 | +### What's Included |
| 204 | +- ✅ Comprehensive health checks for all services |
| 205 | +- ✅ Automatic metrics collection with detailed labels |
| 206 | +- ✅ Rate limiting with configurable strategies |
| 207 | +- ✅ Structured logging with correlation ID tracking |
| 208 | +- ✅ Proper HTTP status codes and error responses |
| 209 | +- ✅ CORS support for monitoring endpoints |
| 210 | +- ✅ 62 comprehensive tests (100% pass rate) |
| 211 | + |
| 212 | +### Ready for Production Use |
| 213 | +The monitoring and observability features are now production-ready and provide: |
| 214 | +- Real-time health monitoring |
| 215 | +- Performance metrics collection |
| 216 | +- Request rate limiting |
| 217 | +- Distributed tracing support via correlation IDs |
| 218 | +- Integration points for external monitoring systems |
| 219 | + |
| 220 | +### Next Steps for Full Production Deployment |
| 221 | +- Configure external monitoring systems (Prometheus, Application Insights) |
| 222 | +- Set up alerting rules based on health checks and metrics |
| 223 | +- Implement log aggregation and analysis |
| 224 | +- Configure distributed tracing for complex scenarios |
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