You are an expert in Go error handling and logging best practices. I'm building an MEV bot in Go that needs robust error handling and comprehensive logging for production deployment.

I need help with:

1. Implementing structured logging throughout the application
2. Creating meaningful error messages for debugging
3. Implementing retry mechanisms for transient failures
4. Handling fatal errors gracefully
5. Implementing circuit breakers for external services
6. Creating health checks and metrics

Please provide production-ready Go code that:
- Uses a structured logging library (like zap or logrus)
- Implements comprehensive error wrapping and context
- Includes retry mechanisms with exponential backoff
- Handles fatal errors gracefully with proper cleanup
- Follows Go best practices for error handling
- Is optimized for performance
- Includes comprehensive comments

The code should:
- Log at appropriate levels (debug, info, warn, error)
- Include contextual information in log messages
- Implement circuit breakers for RPC connections
- Handle timeouts appropriately
- Provide health check endpoints
- Export metrics for monitoring