创建跨追踪的链接

using System.Diagnostics;
using OpenTelemetry;
using OpenTelemetry.Trace;

// Create an activity source
var activitySource = new ActivitySource("MyCompany.MyApplication");

// Configure OpenTelemetry
using var tracerProvider = Sdk.CreateTracerProviderBuilder()
    .AddSource("MyCompany.MyApplication")
    .AddConsoleExporter()
    .Build();

// Start a parent activity
using (var orchestratingActivity = activitySource.StartActivity("OrchestratingActivity"))
{
    orchestratingActivity?.SetTag("operation", "main-process");

    // Fan out to multiple operations with linked activities
    await DoFanoutAsync(activitySource, 3);

    // Continue with the original activity
    using (var nestedActivity = activitySource.StartActivity("WrapUp"))
    {
        nestedActivity?.SetTag("status", "completed");
    }
}

// Method that creates new root activities with links
async Task DoFanoutAsync(ActivitySource source, int operationCount)
{
    // Store the current activity to restore it later
    var previous = Activity.Current;

    // Get the context of the current activity for linking
    var activityContext = Activity.Current!.Context;
    var links = new List<ActivityLink>
    {
        new ActivityLink(activityContext),
    };

    var tasks = new List<Task>();

    // Create multiple new root activities that link to the original activity
    for (int i = 0; i < operationCount; i++)
    {
        int operationIndex = i;

        var task = Task.Run(() =>
        {
            // Set the current activity to null to create a new root activity
            Activity.Current = null;

            // Create a new root activity with a link to the original activity
            using var newRootActivity = source.StartActivity(
                ActivityKind.Internal,
                name: $"FannedOutActivity {operationIndex + 1}",
                links: links);

            // Perform work for this operation...
        });

        tasks.Add(task);
    }

    // Wait for all fanned-out operations to complete
    await Task.WhenAll(tasks);

    // Restore the original activity context
    Activity.Current = previous;
}

Activity.TraceId:            5ce4d8ad4926ecdd0084681f46fa38d9
Activity.SpanId:             8f9e9441f0789f6e
Activity.TraceFlags:         Recorded
Activity.ActivitySourceName: MyCompany.MyApplication
Activity.DisplayName:        FannedOutActivity 1
Activity.Kind:               Internal
Activity.StartTime:          2023-10-17T01:24:40.4957326Z
Activity.Duration:           00:00:00.0008656
Activity.Links:
    2890476acefb53b93af64a0d91939051 16b83c1517629363