Update OpenTelemetryChatClient to 1.34 (#6466)

Author: stephentoub

src/Libraries/Microsoft.Extensions.AI/ChatCompletion/OpenTelemetryChatClient.cs

@@ -25,7 +25,7 @@ namespace Microsoft.Extensions.AI;
 
 /// <summary>Represents a delegating chat client that implements the OpenTelemetry Semantic Conventions for Generative AI systems.</summary>
 /// <remarks>
-/// This class provides an implementation of the Semantic Conventions for Generative AI systems v1.33, defined at <see href="https://opentelemetry.io/docs/specs/semconv/gen-ai/" />.
+/// This class provides an implementation of the Semantic Conventions for Generative AI systems v1.34, defined at <see href="https://opentelemetry.io/docs/specs/semconv/gen-ai/" />.
 /// The specification is still experimental and subject to change; as such, the telemetry output by this client is also subject to change.
 /// </remarks>
 public sealed partial class OpenTelemetryChatClient : DelegatingChatClient
@@ -247,6 +247,11 @@ public override async IAsyncEnumerable<ChatResponseUpdate> GetStreamingResponseA
 
                 if (options is not null)
                 {
+                    if (options.ConversationId is string conversationId)
+                    {
+                        _ = activity.AddTag(OpenTelemetryConsts.GenAI.Conversation.Id, conversationId);
+                    }
+
                     if (options.FrequencyPenalty is float frequencyPenalty)
                     {
                         _ = activity.AddTag(OpenTelemetryConsts.GenAI.Request.FrequencyPenalty, frequencyPenalty);

src/Libraries/Microsoft.Extensions.AI/Embeddings/OpenTelemetryEmbeddingGenerator.cs

@@ -19,7 +19,7 @@ namespace Microsoft.Extensions.AI;
 
 /// <summary>Represents a delegating embedding generator that implements the OpenTelemetry Semantic Conventions for Generative AI systems.</summary>
 /// <remarks>
-/// This class provides an implementation of the Semantic Conventions for Generative AI systems v1.33, defined at <see href="https://opentelemetry.io/docs/specs/semconv/gen-ai/" />.
+/// This class provides an implementation of the Semantic Conventions for Generative AI systems v1.34, defined at <see href="https://opentelemetry.io/docs/specs/semconv/gen-ai/" />.
 /// The specification is still experimental and subject to change; as such, the telemetry output by this client is also subject to change.
 /// </remarks>
 /// <typeparam name="TInput">The type of input used to produce embeddings.</typeparam>

src/Libraries/Microsoft.Extensions.AI/OpenTelemetryConsts.cs

@@ -54,6 +54,11 @@ public static class TokenUsage
             }
         }
 
+        public static class Conversation
+        {
+            public const string Id = "gen_ai.conversation.id";
+        }
+
         public static class Operation
         {
             public const string Name = "gen_ai.operation.name";