How to restart when instance freezes

[alexander-held]

When pasting a lot of lines into the JupyterLab terminal (9k+ in my case), everything seems to freeze and become unresponsive. When closing the tab and trying to open a new one, that one will time out. What still seems to work in this case is opening the hub control panel directly (either from the menu in the JupyterLab instance, which still does work, or directly if one remembers the URL). Shutting the instance down from the hub control panel is still possible.

It might be useful to document this at https://coffea-casa.readthedocs.io/en/latest/cc_issues.html or similar.