# SPEC-012: Advanced Monitoring and Metrics

## Overview
Comprehensive observability and monitoring system with Prometheus metrics, Grafana dashboards, alerting, and request tracing for enterprise-grade monitoring.

## Components

### Metrics Collection
- **Prometheus Integration**: Native Prometheus metrics export
- **Custom Metrics**: RabbitMQ-specific metrics and KPIs
- **Performance Metrics**: Response time, throughput, error rates
- **Resource Metrics**: Memory, CPU, connection pool health
- **Business Metrics**: Message processing rates, queue depths

### Monitoring Dashboards
- **Grafana Integration**: Pre-built dashboards for RabbitMQ monitoring
- **Real-time Visualization**: Live performance and health monitoring
- **Custom Dashboards**: Configurable dashboards for specific use cases
- **Alert Visualization**: Visual representation of alerts and thresholds

### Alerting System
- **Configurable Alerts**: Customizable alert rules and thresholds
- **Multiple Channels**: Email, Slack, PagerDuty, webhook notifications
- **Alert Escalation**: Multi-level alert escalation policies
- **Alert Suppression**: Smart alert suppression to prevent noise

### Request Tracing
- **MCP Request Correlation**: End-to-end request tracing
- **Message Flow Tracking**: Track messages across queues and consumers
- **Performance Tracing**: Detailed latency breakdown
- **Distributed Tracing**: Support for distributed message processing

### Health Monitoring
- **Service Health**: RabbitMQ service availability and status
- **Connection Health**: Connection pool and broker health
- **Queue Health**: Queue depth, consumer health, processing rates
- **System Health**: Memory usage, CPU, disk space monitoring

### Internal Operations (Auto-generated from OpenAPI)
**OpenAPI-Driven**: Monitoring operations derived from RabbitMQ Management API.

- `queues.get-stats`: GET /api/queues/{vhost}/{name} - Get queue statistics (from OpenAPI)
- `exchanges.get-stats`: GET /api/exchanges/{vhost}/{name} - Get exchange metrics (from OpenAPI)
- `connections.list`: GET /api/connections - Get connection statistics (from OpenAPI)
- `nodes.get`: GET /api/nodes/{name} - Get node health and metrics (from OpenAPI)
- `health.get-overview`: GET /api/overview - Get cluster overview (from OpenAPI)
- `monitor.prometheus-metrics`: Custom Prometheus metrics export (NOT in OpenAPI)

**Note**: Most operations auto-generated from OpenAPI. Custom monitoring wraps these with Prometheus exposition.

## Technical Requirements

### Metrics System
- Prometheus metrics export on /metrics endpoint
- Custom metrics for RabbitMQ operations
- Metrics collection interval: 30 seconds (configurable)
- Metric retention: 30 days (configurable)

### Performance Monitoring
- Response time tracking per operation
- Throughput monitoring (requests/minute)
- Error rate tracking and categorization
- Resource usage monitoring (CPU, memory, connections)

### Alerting Configuration
- Configurable alert thresholds
- Multiple notification channels
- Alert suppression and escalation
- Alert history and analytics

### Dashboard Features
- Pre-built Grafana dashboards
- Real-time data visualization
- Custom dashboard creation
- Dashboard sharing and collaboration

### Tracing System
- Request correlation IDs
- Message flow tracking
- Performance breakdown analysis
- Distributed tracing support

## Acceptance Criteria

### Functional Requirements
- [ ] Prometheus metrics are exported correctly
- [ ] Grafana dashboards display accurate data
- [ ] Alerting system triggers and notifies properly
- [ ] Request tracing provides end-to-end visibility
- [ ] Health monitoring detects issues accurately

### Performance Requirements
- [ ] Metrics collection overhead < 1% of system resources
- [ ] Dashboard refresh time < 5 seconds
- [ ] Alert notification delivery < 30 seconds
- [ ] Tracing overhead < 5ms per request

### Reliability Requirements
- [ ] Monitoring system is highly available
- [ ] Metrics data is accurate and consistent
- [ ] Alerts are reliable and not noisy
- [ ] Tracing data is complete and accurate

### Usability Requirements
- [ ] Dashboards are intuitive and informative
- [ ] Alert configuration is straightforward
- [ ] Monitoring data is actionable
- [ ] Documentation is comprehensive

## Dependencies
- Prometheus for metrics collection
- Grafana for dashboard visualization
- AlertManager for alerting
- OpenTelemetry for distributed tracing

## Implementation Notes
- Use Prometheus client library for metrics export
- Implement custom RabbitMQ-specific metrics
- Set up Grafana with pre-built dashboards
- Configure AlertManager for alert routing
- Implement OpenTelemetry for distributed tracing
- Set up monitoring infrastructure as code
- Create monitoring runbooks and procedures
- Implement monitoring data retention policies