Program.cs

// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

using System.Diagnostics.Metrics;
using OpenTelemetry;
using OpenTelemetry.Exporter;
using OpenTelemetry.Metrics;

public class Program
{
    private static readonly Meter MyMeter = new("MyCompany.MyProduct.MyLibrary", "1.0");
    private static readonly Counter<long> MyFruitCounter = MyMeter.CreateCounter<long>("MyFruitCounter");

    public static void Main()
    {
        var meterProvider = Sdk.CreateMeterProviderBuilder()
            .AddMeter("MyCompany.MyProduct.MyLibrary")
            .AddOtlpExporter((exporterOptions, metricReaderOptions) =>
            {
                exporterOptions.Endpoint = new Uri("http://localhost:9090/api/v1/otlp/v1/metrics");
                exporterOptions.Protocol = OtlpExportProtocol.HttpProtobuf;
                metricReaderOptions.PeriodicExportingMetricReaderOptions.ExportIntervalMilliseconds = 1000;
            })
            .Build();

        Console.WriteLine("Press any key to exit");

        while (!Console.KeyAvailable)
        {
            MyFruitCounter.Add(1, new("name", "apple"), new("color", "red"));
            MyFruitCounter.Add(2, new("name", "lemon"), new("color", "yellow"));
            MyFruitCounter.Add(1, new("name", "lemon"), new("color", "yellow"));
            MyFruitCounter.Add(2, new("name", "apple"), new("color", "green"));
            MyFruitCounter.Add(5, new("name", "apple"), new("color", "red"));
            MyFruitCounter.Add(4, new("name", "lemon"), new("color", "yellow"));

            Thread.Sleep(300);
        }

        // Dispose meter provider before the application ends.
        // This will flush the remaining metrics and shutdown the metrics pipeline.
        meterProvider.Dispose();
    }
}