YuviPanda 474005cbd1 Use idle culler from jupyterhub-idle-culler package ...

The idle culler lives as a script in at least 3 different
places:

- In the JupyterHub repo, as an 'example'
  d126baa443/examples/cull-idle
- In the TLJH repo, as a core part of the service
  01ba34857d/tljh/cull_idle_servers.py.
  This is an import from a specific version of the JupyterHub repo,
  and has had a couple of changes made to it since.
- In the z2jh repo, as a core part of the service
  c3f3be25f8/jupyterhub/files/hub/cull_idle_servers.py
  This is also an import from a specific version of the JupyterHub
  repo, but has had a lot more work done on it. Most had been sync'd
  back the JupyterHub repo, but some had not been. See
  9c15a42b12/images/hub/cull_idle_servers.py
  and https://github.com/jupyterhub/zero-to-jupyterhub-k8s/commits/master/jupyterhub/files/hub/cull_idle_servers.py

The idle culler is a core integral part of every JupyterHub deployment
these days. It would be great if it was maintained separately on
its own, without being split across multiple repos.

The latest changes had been to the version in the JupyterHub repo, so I
copied it (while preserving commit history, because credit is important)
to a new repository: https://github.com/yuvipanda/jupyterhub-idle-culler

I looked through z2jh and tljh copies, and cherry-picked the following
changes manually

ae80fb5163
836f19a4c7
a0787c64f1
b230ef8156
20374db7c6 (diff-f00cd100e9f673285208aaa6fc0c3212)

There were a few from 9c15a42b12/images/hub/cull_idle_servers.py
I could not apply, but mostly because those features had been
re-implemented already.

Right now, the package is a direct port of the code we had. Once
this settles in, I am hopefull we can iterate faster and make cool
new changes.

2020-05-03 16:00:07 +05:30

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