Add possibility to show ALL chart description by default in Superset dashboard

[andreabrumana]

Background
Chart description are very useful in order to inform stakeholders about the data shown in charts. Superset allows the possibility of inserting a description, that is not shown by default. In order to show it, one can:

• Click manually, each time, on "Toggle description" (as a dashboard user)
• Modify the .json metadata file and set expanded_slices as true, for the specified chart_ids (as a dashboard developer).

Feature request
Since may happen that we have a lot of charts and that new charts can be added to the dashboard, there should be a a possibility to set expanded_slice: true for ALL charts present in the dashboard, without the need of making it explicit this chart by chart.

[sfirke]

This is great idea for a feature. I'd also like to see, for when someone is specifying individual charts, if there's a way to just list slice IDs instead of typing the true over and over like "935": true,

[Manish-2022]

Where can i find this .json metadata file

[abagh0703]

Where can i find this .json metadata file

Edit dashboard --> Edit properties --> Advanced --> JSON Metadata.

You add an entry like "expanded_slices": {"123": true}, to the root of the json. To get the value for 123, you get the slice id, which you can find in the url when editing a chart.

[sfirke]

Now I wonder if we could go one farther and set a Superset-wide config variable that would apply across dashboards to default showing a chart description to true.

[SBIN2010]

How about having an information icon displayed on the chart by default—showing a tooltip with the description on hover—while hiding the icon if the description display is enabled?
@sfirke @andreabrumana
What do you think of that approach?

[sfirke]

@SBIN2010 I think what you propose is an improvement for sure. The two states for a description would be either shown or tool tip, with tooltip replacing invisible (the current state if not shown).

That doesn't entirely address this discussion thread, though it would make it less urgent to address.

[SBIN2010]

While looking into this, I found that the "expand_all_slices" functionality had already been added to the dashboard configuration

[SBIN2010]

implemented in #32958

[sfirke]

Oh! Nice find.

[SBIN2010]

For example, like this:

[SBIN2010]

PR created #43271