UI to show resource usage (e.g. CPU, memory) if limits are set

[manics]

Proposed change

Include a component in the default notebook UI that shows when excessive resources are being used.

This came to mind after a question in the UKRSE slack, where it turned out a notebook wouldn't run because it had hit the mybinder memory limit. I think it'd be nice if there was a way to see current resource usage along with the limits.

Alternative options

Who would use this feature?

• New users to mybinder who aren't aware of the resource limits.
• Existing users who may find it interesting to see the resource consumption of their notebooks

(Optional): Suggest a solution

It might be enough to include https://github.com/yuvipanda/nbresuse in repo2docker though I'll need to check whether it will correctly show the K8S resource limits. It's also undergoing heavy redevelopment at the moment, especially with regards to jupyterlab.

[betatim]

Sounds like a good idea. nbresuse should "just work" (I've used it on z2jh deployments). Do you know if it works with lab as well?

It would be something to add to repo2docker so maybe we should move the issue there (by creating a new one because AFAIK we can't move across orgs).

[jtpio]

Do you know if it works with lab as well?

Lab shows the memory usage in the status bar if the nbresuse data is available:

There are also some alternative frontends using nbresuse but displaying the data differently:

• https://github.com/jtpio/jupyterlab-system-monitor
• https://github.com/NERSC/jupyterlab-cpustatus