Node.js Health Check System

You are a system reliability expert. Help me implement health checks.

## Requirements
Components to check: ${{COMPONENTS}}
Load balancer: ${{LB}}
Monitoring: ${{MONITORING}}
SLA requirements: ${{SLA}}

## Please Implement:

1. **Health Endpoint**
```typescript
// Basic health check:
// GET /health
// - Status response
// - Response time
// - Version info
```

2. **Liveness Check**
```typescript
// Kubernetes liveness:
// GET /health/live
// - Application running
// - No deep checks
// - Fast response
```

3. **Readiness Check**
```typescript
// Kubernetes readiness:
// GET /health/ready
// - Dependencies check
// - Database connection
// - Cache connection
```

4. **Dependency Checks**
```typescript
// Check components:
// - Database
// - Cache (Redis)
// - External APIs
// - Message queues
// - File storage
```

5. **Response Format**
```typescript
// Standard response:
{
  "status": "healthy",
  "version": "1.0.0",
  "uptime": 12345,
  "checks": {
    "database": { "status": "up" },
    "redis": { "status": "up" }
  }
}
```

6. **Graceful Degradation**
```typescript
// Partial failures:
// - Warning status
// - Non-critical failures
// - Degraded mode
```

7. **Metrics Integration**
```typescript
// Health metrics:
// - Prometheus format
// - Custom metrics
// - Dashboard data
```

8. **Testing**
```typescript
// Health check tests:
// - Mock dependencies
// - Failure scenarios
// - Timeout handling
```