Issues

• bug(langchain): failed streaming LLM runs retain IDs in callback memo

  bugintegration-langchainsdk-python
  langfuse/langfuse-python#1977 · Filter by author dhionson2 opened on Oct 11, 2026
  

• tests/unit/test_prompt.py fails on a fresh clone without LANGFUSE_* env vars

  bugfeat-prompt-managementsdk-python
  langfuse/langfuse-python#1976 · Filter by author Mathoholic opened on Oct 10, 2026
  3

• bug: ChatPromptClient.compile appends str(whole list) once per non-dict placeholder item

  bugfeat-prompt-managementsdk-python
  langfuse/langfuse-python#1971 · Filter by author moneebullah25 opened on Oct 9, 2026
  

• bug: LANGFUSE_MAX_EVENT_SIZE_BYTES is parsed but never enforced for score events

  bugfeat-scoressdk-python
  langfuse/langfuse-python#1966 · Filter by author moneebullah25 opened on Oct 9, 2026
  

• bug: non-numeric status in a 207 error entry raises inside handle_exception, kills the score consumer thread, flush()/shutdown() then hang

  bugfeat-scores[Integrations] Language Clientssdk-python
  langfuse/langfuse-python#1967 · Filter by author moneebullah25 opened on Oct 9, 2026
  

• bug: Partial-failure (207) ingestion response retries the whole batch up to 3x; per-item error details only logged at DEBUG

  bugfeat-ingestion
  langfuse/langfuse-python#1965 · Filter by author moneebullah25 opened on Oct 9, 2026
  

• bug: GCS upload detection in MediaManager uses substring match on the full URL

  bugfeat-multimodal-mediasdk-python
  langfuse/langfuse-python#1913 · Filter by author Ad1th opened on Sep 30, 2026
  1

  

• mask is not applied to create_dataset_item or create_score(comment=)

  bugcompliancefeat-data-maskingsdk-pythonsecurity
  langfuse/langfuse-python#1896 · Filter by author hchittanuru3 opened on Sep 23, 2026
  1

  

• Scores bypass sample_rate since v4

  feat-scoressdk-pythonunconfirmed-bug
  langfuse/langfuse-python#1890 · Filter by author moldhouse opened on Sep 18, 2026
  

• batch_evaluation fails on self-hosted v4 events_only deployments (uses unavailable v3 read endpoints)

  bugfeat-evalssdk-python
  langfuse/langfuse-python#1861 · Filter by author Rainbow-prince opened on Sep 5, 2026
  2

  

• [HTTPXodus] Consider migrating from httpx to httpx2 (the actively maintained fork)

  improvementsdk-python
  langfuse/langfuse-python#1856 · Filter by author ProgrammerPlus1998 opened on Sep 4, 2026
  

• [HTTPXodus] Consider migrating from httpx to httpx2 (the actively maintained fork)

  improvementsdk-pythonsecurity
  langfuse/langfuse-python#1855 · Filter by author ProgrammerPlus1998 opened on Sep 4, 2026
  

• Responses.retrieve is not instrumented, so background responses lose output, usage and cost

  billingbugfeat-billingfeat-llm-cost-trackingintegration-openaisdk-python
  langfuse/langfuse-python#1834 · Filter by author Kairick opened on Aug 24, 2026
  1

  

• Langfuse.shutdown() hangs forever on _score_ingestion_queue.join() — cached LangfuseResourceManager is reused after shutdown

  bug[Integrations] Language Clientssdk-python
  langfuse/langfuse-python#1799 · Filter by author bagowix opened on Aug 5, 2026
  1

  

• feat(sdk): support multiple OTLP span exporters (dual-write alongside Langfuse)

  feat-otelintegration-otelintegration-python-decoratorsdk-python
  langfuse/langfuse-python#1716 · Filter by author loveRhythm1990 opened on Jun 18, 2026
  2

  

• Suppress "Placeholders have not been resolved" warning when MessagesPlaceholder use is intentional (LangChain integration)

  bugintegration-langchainintegrationssdk-python
  langfuse/langfuse-python#1667 · Filter by author s0ftnote opened on May 22, 2026
  1

  

• CallbackHandler.on_chain_start does not pass trace_name to propagate_attributes, causing non-deterministic trace names on LangGraph resume

  bugintegration-langchainsdk-python
  langfuse/langfuse-python#1602 · Filter by author Edison-A-N opened on Apr 1, 2026
  1

  

• All Langfuse Issues are in langfuse/langfuse

  langfuse/langfuse-python#91 · Filter by author marcklingen opened on Sep 15, 2023
  2