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Summary Add module-level debug logging to track Agent canvas execution flow (Closes #9306), enabling developers to diagnose component invocation, input/output states, and variable resolution without modifying production code. Also fix related bugs in message.py: re.sub backreference issue and unawaited _save_to_memory coroutine causing silent memory save failures. Changes agent/canvas.py: log workflow start, component invocation, and component completion agent/component/agent_with_tools.py: log Agent parameter resolution and LLM invocation path; standardize json.dumps usage agent/component/base.py: log get_input() variable resolution branches agent/component/message.py: fix re.sub backreference issue; properly await _save_to_memory coroutine Design Uses module-level loggers (logging.getLogger(__name__)) to support selective debugging: LOG_LEVELS=agent=DEBUG Zero performance impact in production (INFO level by default) Works with existing PUT /system/config/log API for runtime level changes Closes #9306 Note: While adding debug logging, I discovered and fixed two related bugs in message.py: - re.sub replacement value was interpreted as regex backreference instead of literal string - _save_to_memory coroutine was not properly awaited, causing silent failures --------- Co-authored-by: wills <willsgao@163.com>