log

type Logger interface {
	// Debug logs the arguments as a single debug message.
	Debug(args ...interface{})
	// Debugf logs a formatted debug message, injecting the arguments into the template string.
	Debugf(template string, args ...interface{})
	// Error logs the arguments as a single error message.
	Error(args ...interface{})
	// Errorf logs a formatted error message, injecting the arguments into the template string.
	Errorf(template string, args ...interface{})
}