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refactor: remove AsyncFileSink logger, add rotation support, and update docs (#9105)

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* refactor(logs): remove asyncfilesink logger, add rotation support, and update docs

* refactor(logs): remove asyncfilesink logger, add rotation support, and update docs

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Co-authored-by: Harry Lyu <harrylyu@umich.edu>
Co-authored-by: Mendon Kissling <59585235+mendonk@users.noreply.github.com>
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XiaochuanLyu 2025-07-26 01:50:45 +08:00 • committed by GitHub
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docs/docs/Develop/logging.mdx
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@ -40,6 +40,12 @@ For example, `LANGFLOW_LOG_FILE=path/to/logfile.log`.
* `LANGFLOW_LOG_ENV=container_csv`: Outputs CSV-formatted plain text to stdout.
* `LANGFLOW_LOG_ENV=default` or unset: Outputs prettified output with [RichHandler](https://rich.readthedocs.io/en/stable/reference/logging.html).
* `LANGFLOW_LOG_ROTATION` controls when the log file is rotated, either based on time or file size. By default, logs are rotated every 1 day.
* Time-based rotation: "1 day", "12 hours", "1 week"
* Size-based rotation: "10 MB", "1 GB"
* Disable rotation: "None" (log files will grow without limit)
A complete example `.env` file is available in the [Langflow repository](https://github.com/langflow-ai/langflow/blob/main/.env.example).
## Flow and component logs