What are the flags to debug kernel messages in JupyterLab?

Are there flags that will make jupyterlab log the messages sent/received to the kernels ?

I remember this being possible (?), but I can’t remember the flags, and jupyterlab --help doesn’t list any.

Many thanks!

Found it! To answer my own question, --Session.debug=true will do it. Example:

jupyter-lab --no-browser --Session.debug=true
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