I have been working on a GCP AI Notebook for the past couple of weeks when I got '524 error'. I followed the troubleshooting instructions here. I connected to the notebook instance via ssh and restarted the Jupyter service. I am now able to open JupyterLab but I can't find any of my work!! Here is the JupyterLab screenshot. I searched for the files using Terminal in JupyterLab as well as the Cloud Shell but nothing. It looks as if my instance had been wiped clean. Please help, I lost all my code I have been working on for the past couple of weeks.
Based on the Terminal output, seems to be you are using a Container based instance. This means that you have a base OS and a Docker instance running JupyterLab service on top. I will be interested in knowing what Docker instance is that you are running. Is this a Deep Learning Container?