log

func DebugWithFields(fields Fields, args ...interface{})

func Debugf(format string, args ...interface{})

func Debugln(args ...interface{})

func ErrorWithFields(fields Fields, args ...interface{})

func Errorf(format string, args ...interface{})

func Errorln(args ...interface{})

func Fatalf(format string, args ...interface{})

func Fatalln(args ...interface{})

func InfoWithFields(fields Fields, args ...interface{})

func Infof(format string, args ...interface{})

func Infoln(args ...interface{})

func Printf(format string, args ...interface{})

func Println(args ...interface{})

func SetOutput(writer io.Writer)

func Warnf(format string, args ...interface{})

func Warnln(args ...interface{})