Golang - Custom Zap Log

	w := zapcore.AddSync(&lumberjack.Logger{
		Filename:   "app.log",
		MaxSize:    1, // megabytes
		MaxBackups: 30,
		MaxAge:     30, // days
	})

	c := zapcore.EncoderConfig{
		MessageKey:     "msg",
		LevelKey:       "level",
		TimeKey:        "time",
		NameKey:        "logger",
		CallerKey:      "file",
		StacktraceKey:  "stacktrace",
		LineEnding:     zapcore.DefaultLineEnding,
		EncodeLevel:    zapcore.LowercaseLevelEncoder,
		EncodeTime:     zapcore.ISO8601TimeEncoder,
		EncodeDuration: zapcore.SecondsDurationEncoder,
		EncodeCaller:   zapcore.ShortCallerEncoder,
		EncodeName:     zapcore.FullNameEncoder,
	}

	core := zapcore.NewCore(
		zapcore.NewJSONEncoder(c),
		zapcore.NewMultiWriteSyncer(zapcore.AddSync(os.Stdout), w),
		zap.InfoLevel,
	)

	logger := zap.New(core, zap.AddCaller(), zap.Development())
	
	logger.Sugar()