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* fix: prevent empty reasoning messages in streaming interfaces Prevents empty "Thinking..." indicators from appearing in clients by filtering out reasoning messages with no content at the source. Changes: - Gemini: Don't emit ReasoningMessage when only thought_signature exists - Gemini: Only emit reasoning content if text is non-empty - Anthropic: Don't emit ReasoningMessage for BetaSignatureDelta - Anthropic: Only emit reasoning content if thinking text is non-empty This fixes the issue where providers send signature metadata before actual thinking content, causing empty reasoning blocks to appear in the UI after responses complete. Affects: Gemini reasoning, Anthropic extended thinking 👾 Generated with [Letta Code](https://letta.com) Co-Authored-By: Letta <noreply@letta.com> * feat: enable Datadog LLM Observability for memgpt-server Enables DD_LLMOBS to track LLM calls, prompts, completions, and costs in production for memgpt-server. Changes: - Add DD_LLMOBS_ENABLED=1 and DD_LLMOBS_ML_APP=memgpt-server in: - .github/workflows/deploy-core.yml (GitHub Actions deployment) - justfile (Helm deployment secrets) - apps/core/letta/server/rest_api/app.py (runtime config) This provides visibility into: - LLM API calls and latency - Prompt/completion content and tokens - Model costs and usage - Error rates per model/provider 👾 Generated with [Letta Code](https://letta.com) Co-Authored-By: Letta <noreply@letta.com> * dd llmobs * Revert "fix: prevent empty reasoning messages in streaming interfaces" This reverts commit a900228b3611de49eb5f740f68dc76a657fc9b14. --------- Co-authored-by: Letta <noreply@letta.com>
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