logger

type Log interface {
	// Info logs to the INFO log.
	Info(args ...interface{})
	// Infof logs to the INFO log.
	Infof(format string, args ...interface{})
	// Warn logs to the WARNING and INFO logs.
	Warn(args ...interface{})
	// Warnf logs to the WARNING and INFO logs.
	Warnf(format string, args ...interface{})
	// Error logs to the ERROR, WARNING, and INFO logs.
	Error(args ...interface{})
	// Errorf logs to the ERROR, WARNING, and INFO logs.
	Errorf(format string, args ...interface{})
}