> ## Documentation Index
> Fetch the complete documentation index at: https://docs.uselumina.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Quality Monitoring

> Monitor response quality with semantic scoring

Detect quality degradation with hybrid scoring.

***

## Scoring Methods

**Exact Match:**

* Hash-based comparison
* Instant results
* Best for structured output

**Semantic Similarity:**

* AI-powered scoring
* \~100ms latency
* Best for natural language

***

## Automatic Baselines

Lumina automatically:

1. Calculates baselines from history
2. Compares new responses
3. Alerts on degradation

***

## Quality Alerts

Triggered when similarity drops:

```
Baseline: 0.92
Current: 0.65 (-29%)
Threshold: -20%
→ Alert sent
```

***

## Custom Metrics

Add your own quality scores:

```typescript theme={null}
await lumina.traceLLM(
  () => llm.generate(prompt),
  {
    metadata: {
      factual_accuracy: calculateAccuracy(response),
      relevance: calculateRelevance(response),
    },
  }
);
```