这个问题可能是因为Lambda函数中的日志记录造成的。在.NET Core 3.1中，可以使用以下代码示例修改日志级别和格式，并解决此问题：

using Microsoft.Extensions.Logging;

public class LambdaFunction
{
    private readonly ILogger _logger;

    public LambdaFunction(ILogger logger)
    {
        _logger = logger;
    }

    public void FunctionHandler()
    {
        _logger.LogInformation("This is a log message with the default format");

        using (_logger.BeginScope("Scope"))
        {
            _logger.LogInformation("This is a log message within a scope");
        }
    }
}

// Adding the following code to the Startup.cs file
public void ConfigureLogging(ILoggingBuilder loggingBuilder)
{
    loggingBuilder.ClearProviders();
    loggingBuilder.AddFilter("Microsoft", LogLevel.Warning);

    loggingBuilder.AddConsole(options =>
    {
        options.IncludeScopes = true;
    });

    loggingBuilder.AddAWSLambdaLogging(_configuration, options =>
    {
        options.IncludeCategory = true;
        options.IncludeLogLevel = true;
        options.IncludeNewline = false;
        options.IncludeException = true;
        options.Filter = (category, logLevel) => logLevel >= LogLevel.Warning;
    });
}

这个示例代码中的重点是AddAWSLambdaLogging方法。在这里，可以使用options参数来设置日志的格式和级别。要禁用额外的换行符，请将IncludeNewline属性设置为false。您还可以使用Filter属性来限制记录的级别。