# Azaion AI Training — Observability

This system is an ML training pipeline, not a web service. Observability focuses on training progress, GPU health, queue throughput, and disk usage rather than HTTP request metrics.

## Logging

### Format

Structured JSON to stdout/stderr. Containers should not write log files — use Docker's log driver for collection.

```json
{
  "timestamp": "2026-03-28T14:30:00Z",
  "level": "INFO",
  "service": "training",
  "message": "Epoch 45/120 completed",
  "context": {"epoch": 45, "loss": 0.0234, "mAP50": 0.891}
}
```

### Log Levels

| Level | Usage | Example |
|-------|-------|---------|
| ERROR | Exceptions, unrecoverable failures | GPU out of memory, API auth failed, corrupt label file |
| WARN | Recoverable issues | Queue reconnection attempt, skipped corrupt image |
| INFO | Progress and business events | Epoch completed, dataset formed, model exported, annotation saved |
| DEBUG | Diagnostics (dev only) | Individual file processing, queue message contents |

### Current State

| Component | Current Logging | Target |
|-----------|----------------|--------|
| Training Pipeline | `print()` statements | Python `logging` with JSON formatter to stdout |
| Annotation Queue | `logging` with TimedRotatingFileHandler | Keep existing + add JSON stdout for Docker |
| Inference Engine | `print()` statements | Not in deployment scope |

### Retention

| Environment | Destination | Retention |
|-------------|-------------|-----------|
| Development | Console (docker logs) | Session |
| Production | Docker JSON log driver → host filesystem | 30 days (log rotation via Docker daemon config) |

### PII Rules

- Never log API passwords or tokens
- Never log CDN credentials
- Never log model encryption keys
- Queue message image data (base64 bytes) must not be logged at INFO level

## Metrics

### Collection Method

No HTTP `/metrics` endpoint — these are batch processes, not services. Metrics are collected via:
1. **Docker stats** — CPU, memory, GPU via `nvidia-smi`
2. **Training logs** — parsed from structured log output (epoch, loss, mAP)
3. **Filesystem monitoring** — disk usage of `/azaion/` directory tree

### Key Metrics

| Metric | Type | Source | Description |
|--------|------|--------|-------------|
| `training_epoch` | Gauge | Training logs | Current epoch number |
| `training_loss` | Gauge | Training logs | Current training loss |
| `training_mAP50` | Gauge | Training logs | Mean average precision at IoU 0.50 |
| `training_mAP50_95` | Gauge | Training logs | mAP at IoU 0.50:0.95 |
| `gpu_utilization_pct` | Gauge | `nvidia-smi` | GPU compute utilization |
| `gpu_memory_used_mb` | Gauge | `nvidia-smi` | GPU memory usage |
| `gpu_temperature_c` | Gauge | `nvidia-smi` | GPU temperature |
| `disk_usage_azaion_gb` | Gauge | `df` / `du` | Total disk usage of `/azaion/` |
| `disk_usage_datasets_gb` | Gauge | `du` | Disk usage of `/azaion/datasets/` |
| `disk_usage_models_gb` | Gauge | `du` | Disk usage of `/azaion/models/` |
| `queue_messages_processed` | Counter | Queue logs | Total annotations processed |
| `queue_messages_failed` | Counter | Queue logs | Failed message processing |
| `queue_offset` | Gauge | `offset.yaml` | Last processed queue offset |

### Monitoring Script

A `scripts/health-check.sh` script (created in Step 7) collects these metrics on demand:
- Checks Docker container status
- Reads `nvidia-smi` for GPU metrics
- Checks disk usage
- Reads annotation queue offset
- Reports overall system health

Collection interval: on-demand via health check script, or via cron job (every 5 minutes) for continuous monitoring.

## Distributed Tracing

Not applicable. The system consists of independent batch processes (training, annotation queue) that do not form request chains. No distributed tracing is needed.

## Alerting

| Severity | Condition | Response Time | Action |
|----------|-----------|---------------|--------|
| Critical | GPU temperature > 90°C | Immediate | Pause training, investigate cooling |
| Critical | Annotation queue process crashed | 5 min | Restart container, check logs |
| Critical | Disk usage > 95% | 5 min | Free space (old datasets/models), expand storage |
| High | Training loss NaN or diverging | 30 min | Check dataset, review hyperparameters |
| High | GPU memory OOM | 30 min | Reduce batch size, restart training |
| Medium | Disk usage > 80% | 4 hours | Plan cleanup of old datasets |
| Medium | Queue offset stale for > 1 hour | 4 hours | Check RabbitMQ connectivity |
| Low | Training checkpoint save failed | Next business day | Check disk space, retry |

### Notification Method

For a single GPU server deployment, alerts are practical via:
- **Cron-based health check** running `scripts/health-check.sh` every 5 minutes
- Critical/High alerts: write to a status file, optionally send email or webhook notification
- Dashboard: a simple status page generated from the last health check output

## Dashboards

### Operations View

For a single-server deployment, a lightweight monitoring approach:

1. **GPU dashboard**: `nvidia-smi dmon` or `nvitop` running in a tmux session
2. **Training progress**: tail structured logs for epoch/loss/mAP progression
3. **Disk usage**: periodic `du -sh /azaion/*/` output
4. **Container status**: `docker ps` + `docker stats`

### Training Progress View

Key information to track during a training run:
- Current epoch / total epochs
- Training loss trend (decreasing = good)
- Validation mAP50 and mAP50-95 (increasing = good)
- GPU utilization and temperature
- Estimated time remaining
- Last checkpoint saved

YOLO's built-in TensorBoard integration provides this out of the box. Access via `tensorboard --logdir /azaion/models/azaion-YYYY-MM-DD/` on the training server.