Avoid using print statements (println!, eprintln!) or custom logging implementations for application logging. Instead, use established logging libraries like `tracing` that provide proper log levels, structured output, and configurable destinations. Print statements bypass logging configuration and cannot be controlled at runtime. Custom logging implementations are error-prone and lack the features of mature libraries. Established logging libraries offer better performance, structured data support, and integration with monitoring systems. Replace debug prints with appropriate log levels: ```rust // Instead of this: println!("🔒 SecurityManager::new() called - checking if security should be enabled"); // Use this: tracing::debug!("SecurityManager::new() called - checking if security should be enabled"); ``` For custom logging needs, extend existing logging infrastructure rather than creating new implementations: ```rust // Instead of rolling your own: pub fn log_debug_event(event: &str) { // custom file writing logic... } // Use tracing with appropriate configuration: tracing::debug!(event = %event, "debug event occurred"); ``` This ensures consistent logging behavior, proper log level control, and integration with the application's logging configuration.