log

type Logger interface {
	Extend(name string) Logger
	Debug(args ...interface{})
	Debugf(template string, args ...interface{})
	Debugw(msg string, keysAndValues ...interface{})
	Error(args ...interface{})
	Errorf(template string, args ...interface{})
	Errorw(msg string, keysAndValues ...interface{})
	Fatal(args ...interface{})
	Fatalf(template string, args ...interface{})
	Fatalw(msg string, keysAndValues ...interface{})
	Info(args ...interface{})
	Infof(template string, args ...interface{})
	Infow(msg string, keysAndValues ...interface{})
	Panic(args ...interface{})
	Panicf(template string, args ...interface{})
	Panicw(msg string, keysAndValues ...interface{})
	Sync() error
	Warn(args ...interface{})
	Warnf(template string, args ...interface{})
	Warnw(msg string, keysAndValues ...interface{})
	WithFields(args ...interface{}) Logger
}