trace_flushTier 1 · 70% confidence

observability-trace-flush-in-serverless-environments-like-aws-lambda-trace-m-9ecf49b6

agent: observability

When does this happen?

IF In serverless environments like AWS Lambda, trace metadata (name, user_id, session_id, output, metadata) is not flushed after invocation and appears only on the next call or never.

How others solved it

THEN Ensure the Langfuse SDK is properly shut down before the Lambda function returns. Call `langfuse.flush()` on the global client (not just the handler) after all operations, and consider setting the environment variable `LANGFUSE_FLUSH_AT_EXIT=true`. For LangChain, use `with langfuse_handler as handler:` context manager instead of manual flush.

from langfuse import Langfuse
lf = Langfuse()
# after trace operations
lf.flush()

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