MetricsEventSource with tag

MetricsEventSourceWithTag.cs

using System.Diagnostics.Metrics;

{
    Console.WriteLine(System.Diagnostics.Process.GetCurrentProcess().Id);
    using var meter = new Meter("app3meter");
    var counter = meter.CreateCounter<int>("histogram1", "unit", "desc");
    async Task CounterTask(CancellationToken ct)
    {
        int count = 2;
        int tagval = 1;
        while(!ct.IsCancellationRequested)
        {
            await Task.Delay(500).ConfigureAwait(false);
            if(counter.Enabled)
            {
                counter.Add(count,
                    new KeyValuePair<string, object?>("tag1", tagval)
                    );
            }
            tagval = tagval ^ 3;
        }
    }
    using var cts = new CancellationTokenSource();
    await Task.WhenAll(CounterTask(cts.Token), Task.Run(() =>
    {
        Console.ReadLine();
        cts.Cancel();
    }));
}

zz-output.csv