MetricsEventSource testing(`dotnet-trace collect` outputs)

VariousMetricsCounters.cs

using System.Diagnostics.Metrics;

{
    Console.WriteLine(System.Diagnostics.Process.GetCurrentProcess().Id);
    using var meter = new Meter("appmeter");
    int obscnt = 1;
    var counter = meter.CreateCounter<int>("counter1", "unit", "desc");
    var histo = meter.CreateHistogram<int>("histogram1", "unit", "desc");
    var gauge = meter.CreateObservableGauge<int>("gauge1", () => 2, "unit2", "desc2");
    var obscounter = meter.CreateObservableCounter<int>("obscounter1", () => { obscnt+=2;return obscnt; }, "unit2", "desc2");
    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)
                    );
            }
            if(histo.Enabled)
            {
                histo.Record(count, new KeyValuePair<string, object?>("tag2", tagval));
            }
            tagval = tagval ^ 3;
        }
    }
    using var cts = new CancellationTokenSource();
    await Task.WhenAll(CounterTask(cts.Token), Task.Run(() =>
    {
        Console.ReadLine();
        cts.Cancel();
    }));
}

zz-memo-ja.md

System.Diagnostics.Metrics/CounterRateValuePublished

• Counterのrateは、RefreshIntervalの間に起こったCounter.Addの合計値
• ObservableCounterのrateは、[最新の値]-[ひとつ前の値]の値

System.Diagnostics.Metrics/HistogramValuePublished

• 得られる値はRefreshIntervalの間に起こったHistogram.Recordの下記三つの値
  • 50%ile
  • 95%ile
  • 99%ile

System.Diagnostics.Metrics/GaugeValuePublished

• 最後に記録された値をそのまま表示

zz-result-counter.csv

zz-result-gauge.csv

zz-result-histogram.csv