add in google genai auto-instrumentation support docs (#33436)

Author: sabrenner

content/en/llm_observability/instrumentation/auto_instrumentation.md

@@ -55,6 +55,7 @@ Datadog's LLM Observability can automatically trace and annotate calls to suppor
 | [OpenAI](#openai), [Azure OpenAI](#openai) | >= 3.0.0           | >= 4.49.0, >= 5.25.0 (CJS), >= 5.38.0 (ESM) |
 | [Vercel AI SDK](#vercel-ai-sdk)            | >=4.0.0            | >= 5.63.0 (CJS), >=5.63.0 (ESM)             |
 | [VertexAI](#vertex-ai)                     | >= 1.0.0           | >= 5.44.0 (CJS), >=5.44.0 (ESM)             |
+| [Google GenAI](#google-genai)              | >= 1.19.0          | >= 5.81.0 (CJS), >=5.81.0 (ESM)             |
 
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 Automatic instrumentation for ESM projects is supported starting from `dd-trace@>=5.38.0`. To enable automatic instrumentation in your ESM projects, run your application with the following Node option:
@@ -360,6 +361,25 @@ The Google GenAI integration instruments the following methods:
 [2]: https://ai.google.dev/api/generate-content#method:-models.generatecontent
 [3]: https://ai.google.dev/api/embeddings#method:-models.embedcontent
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+The Google GenAI integration automatically traces methods in the [Google GenAI Node.js SDK][1] by instrumenting the [`@google/genai` package][4].
+
+**Note:** The [Google GenAI Node.js SDK][1] succeeds the [Google GenerativeAI SDK][6], and exposes both Gemini Developer API as well as Vertex.
+
+### Traced methods
+
+The Google GenAI integration instruments the following methods:
+
+- [Generating content][2] (including [streamed calls][5])
+- [Embedding content][3]
+
+[1]: https://ai.google.dev/gemini-api/docs#javascript
+[2]: https://ai.google.dev/api/generate-content#text_gen_text_only_prompt-JAVASCRIPT
+[3]: https://ai.google.dev/api/embeddings#embed_content-JAVASCRIPT
+[4]: https://www.npmjs.com/package/@google/genai
+[5]: https://ai.google.dev/api/generate-content#text_gen_text_only_prompt_streaming-JAVASCRIPT
+[6]: https://www.npmjs.com/package/@google/generative-ai
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