Today when I open it, I saw that all my files have disappeared inside it and there is a word of version upgrade - new version is available on top of it.
I got confused and then I searched on how to upgrade it, finding info here: https://github.com/googledatalab/datalab/wiki/Release-Info
So I used the method like this:
datalab delete --keep-disk ${VM-Name}
datalab create ${VM-Name}
Now I got a new version of the datalab, but my previous code is missing. :( Can anyone help? I think the disk should be kept.. somewhere..