Customize decision on culling

[rccern]

Proposed change

In our Jupyterhub deployment we have the possibility of assigning users to nodes with GPU, which are a "scarce" resource. For this reason, we would like to have different timeouts depending on which resources the users have booked, e.g. letting sessions expire after 2h since last_activity for nodes with GPUs and 6h for nodes using only CPU.

Alternative options

Implement this in another culler that we keep for our deployment

Who would use this feature?

Admins who desire to customize the culler behaviour. Use cases include reserving resources for shorter periods of time for some type of resources, a longer period for users with a specific role...

(Optional): Suggest a solution

I was thinking about customizing the should_cull https://github.com/jupyterhub/jupyterhub-idle-culler/blob/main/jupyterhub_idle_culler/__init__.py#L238 with a configurable callable which takes as inputs the user and the server objects and returns a boolean. Does it make any sense?

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[rccern]

I noticed only after publishing that this is essentially a duplicate of #25 , let me know if you prefer that I close this one and continue the discussion there

[manics]

#25 or one of the issues linked there is definitely the best place. Would you mind copying your use case there? Thanks!