Retrieval Metrics Dashboard

As a Lead AI Engineer, design a retrieval metrics dashboard for our RAG system.

## System Components
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## Current Pain Points
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## Stakeholders
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Design dashboards for different audiences:

**Engineering Dashboard**
- Latency breakdowns (P50, P95, P99)
- Cache hit rates
- Index health metrics
- Error rates and types

**Quality Dashboard**
- Retrieval precision/recall (sampled)
- User feedback signals
- Hallucination rates
- Query failure categories

**Business Dashboard**
- Query volume trends
- Cost per query
- User satisfaction metrics
- Feature adoption

Provide:
- Metric definitions
- Data collection requirements
- Grafana/Datadog JSON
- Alert configurations