[BOT ISSUE] Spring AI instrumentation limited to OpenAI and Anthropic chat models; no embedding model support

Empieza por BraintrustSpringAI.java y BraintrustObservationHandler.java; después revisa los dos módulos de auto-instrumentación y BraintrustSpringAITest.java. Determina cómo deberían cubrirse los proveedores de Spring AI enumerados y EmbeddingModelObservationContext; se considera terminado cuando las llamadas de chat y embedding compatibles crean los spans esperados, con pruebas que cubran el comportamiento añadido.

Summary

The Spring AI instrumentation module (springai_1_0_0) only wraps OpenAiChatModel.Builder and AnthropicChatModel.Builder. All other Spring AI chat model providers — including Google Vertex AI Gemini, Mistral, AWS Bedrock, and Azure OpenAI — are silently passed through with no instrumentation. Additionally, Spring AI's EmbeddingModel interface is not instrumented for any provider.

Unlike the analogous LangChain4j gap (#60), unsupported Spring AI providers generally cannot fall through to this repo's direct SDK auto-instrumentation modules. Spring AI providers use their own HTTP transport layers (Spring RestClient, Google Cloud libraries, Azure SDK, AWS SDK) rather than the upstream provider SDKs that the auto-instrumentation modules target (com.openai:openai-java, com.anthropic:anthropic-java, com.google.genai).

What is missing

1. Chat model providers beyond OpenAI and Anthropic

BraintrustSpringAI.wrap() (lines 17–39) checks the builder class name against two hardcoded strings:

private static final String OPENAI_BUILDER_CLASS =
        "org.springframework.ai.openai.OpenAiChatModel$Builder";
private static final String ANTHROPIC_BUILDER_CLASS =
        "org.springframework.ai.anthropic.AnthropicChatModel$Builder";

Unrecognized builders are returned unmodified with a log.info() message. No BraintrustObservationHandler is registered, so no spans are created.

The most impactful missing providers:

The auto-instrumentation modules (SpringAIOpenAIInstrumentationModule, SpringAIAnthropicInstrumentationModule) similarly only register ByteBuddy advice for the two known builder classes.

2. Embedding model instrumentation

BraintrustObservationHandler implements ObservationHandler<ChatModelObservationContext> only. Spring AI also fires observations for embedding calls via EmbeddingModelObservationContext, but no handler is registered for these. This means all Spring AI embedding calls — including OpenAI and Anthropic embeddings through Spring AI — produce no Braintrust spans.

Spring AI's EmbeddingModel interface is implemented by OpenAiEmbeddingModel, VertexAiEmbeddingModel, BedrockEmbeddingModel, and others.

Braintrust docs status

• Spring AI is not mentioned on the Braintrust integrations page at https://www.braintrust.dev/docs/integrations/ai-providers: not_found
• No Spring AI-specific documentation exists for the Java SDK

Upstream sources

• Spring AI supported models: https://docs.spring.io/spring-ai/reference/api/chatmodel.html — documents 15+ chat model implementations
• Spring AI embedding models: https://docs.spring.io/spring-ai/reference/api/embeddings.html — documents EmbeddingModel interface and implementations for OpenAI, Vertex AI, Bedrock, etc.
• Spring AI observation support: https://docs.spring.io/spring-ai/reference/api/observability.html — documents ChatModelObservationContext and EmbeddingModelObservationContext for Micrometer-based tracing
• Spring AI releases: https://github.com/spring-projects/spring-ai/releases — actively maintained, GA since v1.0.0

Local files inspected

• braintrust-sdk/instrumentation/springai_1_0_0/src/main/java/dev/braintrust/instrumentation/springai/v1_0_0/BraintrustSpringAI.java — lines 17–39 (hardcoded builder class checks; unrecognized builders passed through)
• braintrust-sdk/instrumentation/springai_1_0_0/src/main/java/dev/braintrust/instrumentation/springai/v1_0_0/BraintrustObservationHandler.java — implements ObservationHandler<ChatModelObservationContext> only; no EmbeddingModelObservationContext handler
• braintrust-sdk/instrumentation/springai_1_0_0/src/main/java/dev/braintrust/instrumentation/springai/v1_0_0/OpenAIBuilderWrapper.java — OpenAI-specific tagging
• braintrust-sdk/instrumentation/springai_1_0_0/src/main/java/dev/braintrust/instrumentation/springai/v1_0_0/AnthropicBuilderWrapper.java — Anthropic-specific tagging
• braintrust-sdk/instrumentation/springai_1_0_0/src/main/java/dev/braintrust/instrumentation/springai/v1_0_0/auto/SpringAIOpenAIInstrumentationModule.java — only targets OpenAiChatModel$Builder.build()
• braintrust-sdk/instrumentation/springai_1_0_0/src/main/java/dev/braintrust/instrumentation/springai/v1_0_0/auto/SpringAIAnthropicInstrumentationModule.java — only targets AnthropicChatModel$Builder.build()
• braintrust-sdk/instrumentation/springai_1_0_0/src/test/java/dev/braintrust/instrumentation/springai/v1_0_0/BraintrustSpringAITest.java — parameterized tests only cover OpenAI and Anthropic; no embedding tests exist