Some otel traces and logging adjustments

.editorconfig

@@ -240,6 +240,9 @@ dotnet_diagnostic.IDE0059.severity = suggestion
 
 dotnet_diagnostic.CA1859.severity = none
 
+# https://learn.microsoft.com/en-us/dotnet/fundamentals/code-analysis/quality-rules/ca1727
+dotnet_diagnostic.CA1727.severity = none
+
 dotnet_diagnostic.IDE0305.severity = none
 
 # https://github.com/dotnet/roslyn/issues/60784

src/api/Elastic.Documentation.Api.Core/AskAi/AskAiUsecase.cs

@@ -30,7 +30,7 @@ public async Task<Stream> AskAi(AskAiRequest askAiRequest, Cancel ctx)
 		};
 		var inputMessagesJson = JsonSerializer.Serialize(inputMessages, ApiJsonContext.Default.InputMessageArray);
 		_ = activity?.SetTag("gen_ai.input.messages", inputMessagesJson);
-		logger.LogInformation("AskAI input message: {InputMessage}", askAiRequest.Message);
+		logger.LogInformation("AskAI input message: {ask_ai.input.message}", askAiRequest.Message);
 		logger.LogInformation("Streaming AskAI response");
 		var rawStream = await askAiGateway.AskAi(askAiRequest, ctx);
 		// The stream transformer will handle disposing the activity when streaming completes

src/api/Elastic.Documentation.Api.Core/SerializationContext.cs

@@ -21,7 +21,7 @@ public record OutputMessage(string Role, MessagePart[] Parts, string FinishReaso
 [JsonSerializable(typeof(SearchRequest))]
 [JsonSerializable(typeof(SearchResponse))]
 [JsonSerializable(typeof(InputMessage))]
-[JsonSerializable(typeof(OutputMessage))]
+[JsonSerializable(typeof(OutputMessage[]))]
 [JsonSerializable(typeof(MessagePart))]
 [JsonSerializable(typeof(InputMessage[]))]
 [JsonSourceGenerationOptions(PropertyNamingPolicy = JsonKnownNamingPolicy.CamelCase)]

src/api/Elastic.Documentation.Api.Infrastructure/Adapters/AskAi/AgentBuilderStreamTransformer.cs

@@ -15,12 +15,18 @@ public class AgentBuilderStreamTransformer(ILogger<AgentBuilderStreamTransformer
 {
 	protected override string GetAgentId() => AgentBuilderAskAiGateway.ModelName;
 	protected override string GetAgentProvider() => AgentBuilderAskAiGateway.ProviderName;
-	protected override AskAiEvent? TransformJsonEvent(string? conversationId, string? eventType, JsonElement json)
+	protected override AskAiEvent? TransformJsonEvent(string? eventType, JsonElement json)
 	{
 		var type = eventType ?? "message";
 		var timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
 		var id = Guid.NewGuid().ToString();
 
+		// Handle error events first - they have a different structure (no "data" wrapper)
+		if (type == "error")
+		{
+			return ParseErrorEvent(id, timestamp, json);
+		}
+
 		// Most Agent Builder events have data nested in a "data" property
 		if (!json.TryGetProperty("data", out var innerData))
 		{
@@ -30,8 +36,6 @@ public class AgentBuilderStreamTransformer(ILogger<AgentBuilderStreamTransformer
 
 		return type switch
 		{
-			"error" =>
-				ParseErrorEvent(id, timestamp, json),
 
 			"conversation_id_set" when innerData.TryGetProperty("conversation_id", out var convId) =>
 				new AskAiEvent.ConversationStart(id, timestamp, convId.GetString()!),

src/api/Elastic.Documentation.Api.Infrastructure/Adapters/AskAi/LlmGatewayStreamTransformer.cs

@@ -47,7 +47,7 @@ protected override async Task ProcessStreamAsync(PipeReader reader, PipeWriter w
 		// Continue with normal stream processing using the actual conversation ID
 		await base.ProcessStreamAsync(reader, writer, actualConversationId, parentActivity, cancellationToken);
 	}
-	protected override AskAiEvent? TransformJsonEvent(string? conversationId, string? eventType, JsonElement json)
+	protected override AskAiEvent? TransformJsonEvent(string? eventType, JsonElement json)
 	{
 		// LLM Gateway format: ["custom", {type: "...", ...}]
 		if (json.ValueKind != JsonValueKind.Array || json.GetArrayLength() < 2)

src/api/Elastic.Documentation.Api.Infrastructure/Adapters/AskAi/SseParser.cs

@@ -6,6 +6,7 @@
 using System.IO.Pipelines;
 using System.Runtime.CompilerServices;
 using System.Text;
+using System.Text.Json.Serialization;
 
 namespace Elastic.Documentation.Api.Infrastructure.Adapters.AskAi;
 
@@ -99,3 +100,7 @@ private static bool TryReadLine(ref ReadOnlySequence<byte> buffer, out string li
 		return true;
 	}
 }
+
+
+[JsonSerializable(typeof(SseEvent))]
+internal sealed partial class SseSerializerContext : JsonSerializerContext;

src/api/Elastic.Documentation.Api.Infrastructure/Adapters/AskAi/StreamTransformerBase.cs

@@ -140,7 +140,7 @@ protected virtual async Task ProcessStreamAsync(PipeReader reader, PipeWriter wr
 				var root = doc.RootElement;
 
 				// Subclass transforms JsonElement to AskAiEvent
-				transformedEvent = TransformJsonEvent(conversationId, sseEvent.EventType, root);
+				transformedEvent = TransformJsonEvent(sseEvent.EventType, root);
 			}
 			catch (JsonException ex)
 			{
@@ -153,6 +153,7 @@ protected virtual async Task ProcessStreamAsync(PipeReader reader, PipeWriter wr
 			{
 				Logger.LogWarning("Transformed event is null for transformer {TransformerType}. Skipping event. EventType: {EventType}",
 					GetType().Name, sseEvent.EventType);
+				Logger.LogWarning("Original event: {event}", JsonSerializer.Serialize(sseEvent, SseSerializerContext.Default.SseEvent));
 				continue;
 			}
 
@@ -213,7 +214,7 @@ protected virtual async Task ProcessStreamAsync(PipeReader reader, PipeWriter wr
 				case AskAiEvent.MessageComplete messageComplete:
 					{
 						outputMessageParts.Add(new MessagePart("text", messageComplete.FullContent));
-						Logger.LogInformation("AskAI output message: {OutputMessage}", messageComplete.FullContent);
+						Logger.LogInformation("AskAI output message: {ask_ai.output.message}", messageComplete.FullContent);
 						break;
 					}
 				case AskAiEvent.ConversationEnd conversationEnd:
@@ -228,22 +229,21 @@ protected virtual async Task ProcessStreamAsync(PipeReader reader, PipeWriter wr
 		// Set output messages tag once after all events are processed
 		if (outputMessageParts.Count > 0)
 		{
-			var outputMessages = new OutputMessage("assistant", outputMessageParts.ToArray(), "stop");
-			var outputMessagesJson = JsonSerializer.Serialize(outputMessages, ApiJsonContext.Default.OutputMessage);
+			var outputMessage = new OutputMessage("assistant", outputMessageParts.ToArray(), "stop");
+			var outputMessages = new[] { outputMessage };
+			var outputMessagesJson = JsonSerializer.Serialize(outputMessages, ApiJsonContext.Default.OutputMessageArray);
 			_ = parentActivity?.SetTag("gen_ai.output.messages", outputMessagesJson);
-			_ = activity?.SetTag("gen_ai.output.messages", outputMessagesJson);
 		}
 	}
 
 	/// <summary>
 	/// Transform a parsed JSON event into an AskAiEvent.
 	/// Subclasses implement provider-specific transformation logic.
 	/// </summary>
-	/// <param name="conversationId">The conversation/thread ID, if available</param>
 	/// <param name="eventType">The SSE event type (from "event:" field), or null if not present</param>
 	/// <param name="json">The parsed JSON data from the "data:" field</param>
 	/// <returns>The transformed AskAiEvent, or null to skip this event</returns>
-	protected abstract AskAiEvent? TransformJsonEvent(string? conversationId, string? eventType, JsonElement json);
+	protected abstract AskAiEvent? TransformJsonEvent(string? eventType, JsonElement json);
 
 	/// <summary>
 	/// Write a transformed event to the output stream