Bring TLJH up to date

[GeorgianaElena]

Background

TLJH is a bit behind adopting new technology and needs some care and love to become more up to date. There might also be functionality missing or not working because of this. But this needs more investigating before knowing for sure.

Expected timeline

It shouldn't take more than a month or two to upgrade TLJH, but it would probably also need some maintenance afterwards to make sure it works for all use-cases and we didn't miss anything.

So, I propose we keep this goal open for about 3 months and actively maintain TLJH during this period.

How will we know when this goal is complete?

• Fix pkg version conflict in TLJH
  jupyterhub-traefik-proxyhas aiohttp pinned to an older version so that it works with the consul python client. However, this pin clashed with chardet latest version and impacted tljh-configfunctionality and has been fixed by pinning thechardetversion. Now, the pin intraefik-proxy made the unit tests to stop functioning. The pin should be removed if possible, or pin any necessary pkg in unit test requiremets to make it work again.
  • Unpin aiohttp in traefik-proxy
  • Cut a new jupyterhub-traefik-proxy release
• Default to Ubuntu 20.04 and Python 3.8
• Default to JupyterLab3 (this should also lower the minimum memory required to install and run TLJH)
• Make the tests use GitHub actions instead of CircleCI
• Investigate deploying the JupyterHub Configurator, potentially turning into a visual of tljh-config cmd tool.

Related issues and links

• tljh-config ContextualVersionConflict - chardet 4 vs jupyterhub-traefik-proxy jupyterhub/the-littlest-jupyterhub#642
• Try unpinning deps and use a more up to date python consul client jupyterhub/traefik-proxy#115
• Use current Ubuntu LTS 20.04 for docker image instead of 18.04 jupyterhub/the-littlest-jupyterhub#665
• Upgrade to Jupyterlab 3.0 and Jupyter Resource Usage jupyterhub/the-littlest-jupyterhub#658
• Switch to GitHub Actions? jupyterhub/the-littlest-jupyterhub#659
• Default to Python 3.8 jupyterhub/the-littlest-jupyterhub#618
• Add the jupyterhub-configurator service jupyterhub/the-littlest-jupyterhub#676

[GeorgianaElena]

I'm closing this as there have been more than 3 months (the intended period for this issue to be open) and most of the items have been addressed.

The TLJH maintenance effort is now being tracked by jupyterhub/the-littlest-jupyterhub#711 (thanks @consideRatio, @yuvipanda and @manics 🎉)