Enable Activity tracking on generic host (#37892)

* Enable Activity tracking on generic host

* Add test

* Remove trailing whitespace

* Bad merge

* React to W3C format change

* Remove conditional fact

Author: shirhatti

src/libraries/Microsoft.Extensions.Hosting/src/Host.cs

@@ -115,6 +115,14 @@ public static IHostBuilder CreateDefaultBuilder(string[] args)
                     // Add the EventLogLoggerProvider on windows machines
                     logging.AddEventLog();
                 }
+
+                logging.Configure(options =>
+                {
+                    options.ActivityTrackingOptions = ActivityTrackingOptions.SpanId
+                                                        | ActivityTrackingOptions.TraceId
+                                                        | ActivityTrackingOptions.ParentId;
+                });
+
             })
             .UseDefaultServiceProvider((context, options) =>
             {

src/libraries/Microsoft.Extensions.Hosting/tests/UnitTests/HostTests.cs

@@ -5,6 +5,7 @@
 using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Diagnostics.Tracing;
 using System.IO;
 using System.Linq;
@@ -60,6 +61,45 @@ public void CreateDefaultBuilder_RegistersEventSourceLogger()
                 args.Payload.OfType<string>().Any(p => p.Contains("Request starting")));
         }
 
+        [Fact]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/34580", TestPlatforms.Windows, TargetFrameworkMonikers.Netcoreapp, TestRuntimes.Mono)]
+        public void CreateDefaultBuilder_EnablesActivityTracking()
+        {
+            var parentActivity = new Activity("ParentActivity");
+            parentActivity.Start();
+            var activity = new Activity("ChildActivity");
+            activity.Start();
+            var id = activity.Id;
+            var logger = new ScopeDelegateLogger((scopeObjectList) =>
+            {
+                Assert.Equal(1, scopeObjectList.Count);
+                var activityDictionary = (scopeObjectList.FirstOrDefault() as IEnumerable<KeyValuePair<string, object>>)
+                                                .ToDictionary(x => x.Key, x => x.Value);
+                switch (activity.IdFormat)
+                {
+                    case ActivityIdFormat.Hierarchical:
+                        Assert.Equal(activity.Id, activityDictionary["SpanId"]);
+                        Assert.Equal(activity.RootId, activityDictionary["TraceId"]);
+                        Assert.Equal(activity.ParentId, activityDictionary["ParentId"]);
+                        break;
+                    case ActivityIdFormat.W3C:
+                        Assert.Equal(activity.SpanId.ToHexString(), activityDictionary["SpanId"]);
+                        Assert.Equal(activity.TraceId.ToHexString(), activityDictionary["TraceId"]);
+                        Assert.Equal(activity.ParentSpanId.ToHexString(), activityDictionary["ParentId"]);
+                        break;
+                }
+            });
+            var loggerProvider = new ScopeDelegateLoggerProvider(logger);
+            var host = Host.CreateDefaultBuilder()
+                .ConfigureLogging(logging =>
+                {
+                    logging.AddProvider(loggerProvider);
+                })
+                .Build();
+
+            logger.LogInformation("Dummy log");
+        }
+
         [Fact]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/34580", TestPlatforms.Windows, TargetFrameworkMonikers.Netcoreapp, TestRuntimes.Mono)]
         public void CreateDefaultBuilder_EnablesScopeValidation()
@@ -178,6 +218,65 @@ public ServiceB(ServiceC c)
 
         internal class ServiceC { }
 
+        private class ScopeDelegateLoggerProvider : ILoggerProvider, ISupportExternalScope
+        {
+            private ScopeDelegateLogger _logger;
+            private IExternalScopeProvider _scopeProvider;
+            public ScopeDelegateLoggerProvider(ScopeDelegateLogger logger)
+            {
+                _logger = logger;
+            }
+            public ILogger CreateLogger(string categoryName)
+            {
+                _logger.ScopeProvider = _scopeProvider;
+                return _logger;
+            }
+
+            public void Dispose()
+            {
+            }
+
+            public void SetScopeProvider(IExternalScopeProvider scopeProvider)
+            {
+                _scopeProvider = scopeProvider;
+            }
+        }
+
+        private class ScopeDelegateLogger : ILogger
+        {
+            private Action<List<object>> _logDelegate;
+            internal IExternalScopeProvider ScopeProvider { get; set; }
+            public ScopeDelegateLogger(Action<List<object>> logDelegate)
+            {
+                _logDelegate = logDelegate;
+            }
+            public IDisposable BeginScope<TState>(TState state)
+            {
+                Scopes.Add(state);
+                return new Scope();
+            }
+
+            public List<object> Scopes { get; set; } = new List<object>();
+
+            public bool IsEnabled(LogLevel logLevel) => true;
+
+            public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
+            {
+                ScopeProvider.ForEachScope((scopeObject, state) =>
+                {
+                    Scopes.Add(scopeObject);
+                }, 0);
+                _logDelegate(Scopes);
+            }
+
+            private class Scope : IDisposable
+            {
+                public void Dispose()
+                {
+                }
+            }
+        }
+
         private class TestEventListener : EventListener
         {
             private volatile bool _disposed;