feat(llm-observability): LangChain spans (#176)

* feat: refactor to dataclasses * feat: spans * test: fix part 1 * test: fix part 2 * test: fix part 3 * test: fix part n * test: add langgraph agent test * chore: bump and linters * chore: bump * fix: correctly capture a parent id when a custom trace_id is set * test: multiple spans parent_ids * fix: exception serialization * refactor: ai_trace_name -> ai_span_name and ai_generation_id -> ai_span_id * fix: logs typos * Add minor breaking change note to changelog * fix: naming --------- Co-authored-by: Michael Matloka <[email protected]>
PostHog · Jan 28, 2025 · 8f43bbc · 8f43bbc
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,11 +1,18 @@
-## 3.11.0 - 2025-01-27
+## 3.11.0 - 2025-01-28
 
-1. Fix serialiazation of Pydantic models in methods.
+1. Add the `$ai_span` event to the LangChain callback handler to capture the input and output of intermediary chains.
+   > LLM observability naming change: event property `$ai_trace_name` is now `$ai_span_name`.
+
+2. Fix serialiazation of Pydantic models in methods.
 
 ## 3.10.0 - 2025-01-24
 
 1. Add `$ai_error` and `$ai_is_error` properties to LangChain callback handler, OpenAI, and Anthropic.
 
+## 3.9.3 - 2025-01-23
+
+1. Fix capturing of multiple traces in the LangChain callback handler.
+
 ## 3.9.2 - 2025-01-22
 
 1. Fix importing of LangChain callback handler under certain circumstances.