Call to checkpoints every 2s

[germandb]

Description

Hi, I'm trying notebook 7 and encounter that when I open a notebook every 2 seconds, a call like this http://localhost:10000/api/contents/work/test.ipynb/checkpoints?1690882333842 is made to the checkpoints endpoint.
The notebook is not actually saved, and no checkpoint gets created.
This doesn't happen when you open the same notebook with Jupyterlab.
The network tab in dev tools with notebook 7

the same info with Jupyterlab

Reproduce

Use docker run -p 10000:8888 jupyter/base-notebook:notebook-7.0.0 for start a new jupyter server
go to http://localhost:10000/tree
create a new notebook
open the network tab
the calls to checkpoints start to appear

Expected behavior

That works like in Jupyterlab, only the sessions and kernels calls are made

Context

• Docker image jupyter/base-notebook:notebook-7.0.0
• Browser: Edge Versión 115.0.1901.188

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[jtpio]

Thanks @germandb for catching this 👍

The checkpoint polling is implemented here in Notebook 7:

notebook/packages/notebook-extension/src/index.ts

Lines 119 to 127 in af22e0a

	new Poll({
	auto: true,
	factory: () => onChange(),
	frequency: {
	interval: 2000,
	backoff: false,
	},
	standby: 'when-hidden',
	});

This is used to update the checkpoint indicator in the top area:

That works like in Jupyterlab, only the sessions and kernels calls are made

Otherwise maybe we could increase the interval?