In member Task UpdateHandler.HandleUpdateAsync(ITelegramBotClient _, Update update, CancellationToken cancellationToken), change parameter name _ to botClient in order to match the identifier as it has been declared in Task IUpdateHandler.HandleUpdateAsync(ITelegramBotClient botClient, Update update, CancellationToken cancellationToken) (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1725)

In externally visible method 'void Startup.Configure(IFunctionsHostBuilder builder)', validate parameter 'builder' is non-null before using it. If appropriate, throw an ArgumentNullException when the argument is null or add a Code Contract precondition asserting non-null argument. (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1062)

Exception type System.IndexOutOfRangeException is reserved by the runtime (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca2201)

For improved performance, use the LoggerMessage delegates instead of calling 'LoggerExtensions.LogInformation(ILogger, string?, params object?[])' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1848)

For improved performance, use the LoggerMessage delegates instead of calling 'LoggerExtensions.LogInformation(ILogger, string?, params object?[])' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1848)

For improved performance, use the LoggerMessage delegates instead of calling 'LoggerExtensions.LogInformation(ILogger, string?, params object?[])' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1848)

For improved performance, use the LoggerMessage delegates instead of calling 'LoggerExtensions.LogInformation(ILogger, string?, params object?[])' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1848)

For improved performance, use the LoggerMessage delegates instead of calling 'LoggerExtensions.LogInformation(ILogger, string?, params object?[])' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1848)

For improved performance, use the LoggerMessage delegates instead of calling 'LoggerExtensions.LogInformation(ILogger, string?, params object?[])' (https://learn.microsoft.com/dotnet/fundamentals/code-analysis/quality-rules/ca1848)