OpenTelemetry-dotnet: Support for true Delta UpDownCounters & ObservableGauges

[ABHISHEK RAJ ANAND]

Discussed in #5753

^{Originally posted by abhishek8 July 17, 2024}
Hi, I have just started using OpenTelemetry with .NET. I have a use case where I need to log specific data points, such as success and failure counts in the application. To avoid data duplication, I am using Delta temporality preference. While I’ve been successful with regular counters, I’m still encountering duplicate data issues with UpDownCounters and ObservableGauges. Can you fix delta temporality to work properly in case of UpdownCounters and ObservableGauges as well?

Below sample code for the same,

using var meterProvider = Sdk.CreateMeterProviderBuilder()
    .AddMeter("MyCompany.MyProduct.MyLibrary")
    .AddConsoleExporter((options, readerOptions) =>
    {
        readerOptions.TemporalityPreference = MetricReaderTemporalityPreference.Delta;
    })
    .Build();

var abc = new Main();
abc.Execute();

internal class Main
{
    private readonly Meter _meter = new("MyCompany.MyProduct.MyLibrary");

    public void Execute()
    {
        Console.WriteLine("Started...");

        _meter.CreateCounter<long>("MyFruitCounter_v1")
            .Add(3, new("name", "apple"), new("color", "red"), new("uid", "9161"));

        _meter.CreateUpDownCounter<long>("MyFruitGauge_v1")
            .Add(3, new("name", "apple"), new("color", "red"), new("uid", "9161"));

        Console.WriteLine("Logged values!");

        while (!Console.KeyAvailable)
        {
            Thread.Sleep(1000);
        }
    }
}