# Changelog 72: Router Logging & Telemetry

**Date:** 2025-12-01
**Type:** Feature
**Task:** TASK-039-18

## Summary

Implemented comprehensive logging and telemetry for the Router Supervisor, providing event tracking, statistics, and session management.

## Changes

### New/Updated Files

- `server/router/infrastructure/logger.py` - Full implementation
- `tests/unit/router/infrastructure/test_logger.py` - 30 tests

### Features

1. **Event Types**
   - INTERCEPT, CONTEXT_ANALYZED, PATTERN_DETECTED
   - CORRECTION_APPLIED, OVERRIDE_TRIGGERED
   - WORKFLOW_EXPANDED, FIREWALL_DECISION
   - EXECUTION_COMPLETE, ERROR

2. **RouterLogger**
   - Event recording with timestamps
   - Session management
   - Statistics tracking
   - Event filtering
   - JSON export

3. **Global Logger**
   - `get_router_logger()` singleton
   - `configure_router_logging()` setup

### API

```python
from server.router.infrastructure.logger import (
    RouterLogger,
    get_router_logger,
)

logger = get_router_logger()
logger.set_session_id("session_123")
logger.log_intercept("mesh_extrude", {"depth": 0.5})
logger.log_correction("mesh_extrude", ["mode_switch"], [...])

# Get stats
stats = logger.get_stats()
summary = logger.get_session_summary()

# Export
logger.export_events("events.json")
```

## Test Coverage

- 30 unit tests for Logger
- 475 total router tests passing

## Related

- Completes Phase 4: SupervisorRouter Integration
