Value formatter is not applied to values in Tooltip

[lantushenko-alex]

Bug description

When I specify Number format in radar chart, the formatter is only applied to values on chart. Values in tooltip remains not formatted. See image attached

Screenshots/recordings

Superset version

6.0.0

Python version

3.9

Node version

16

Browser

Chrome

Additional context

No response

Checklist

• I have searched Superset docs and Slack and didn't find a solution to my problem.
• I have searched the GitHub issue tracker and didn't find a similar bug report.
• I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.

[dosubot]

Hi @lantushenko-alex! I'm Dosu and I’m helping the superset team.

This is a known limitation in Superset 6.0.0: the number format you set for radar charts is applied to chart labels, but not to tooltip values. The root cause is that the tooltip rendering logic (renderNormalizedTooltip in superset-frontend/plugins/plugin-chart-echarts/src/Radar/utils.ts) inserts raw metric values into the tooltip HTML without applying the number formatter, unlike the chart labels which do use the formatter via formatLabel in transformProps.ts reference reference.

There’s no built-in UI workaround for this. To fix it, you’d need to update the tooltip rendering code to apply the number formatter to each value before rendering. This pattern of inconsistent tooltip formatting has also been reported in other chart types (like mixed, line, and pie charts) and is recognized as a regression in recent versions example example.

If you want to patch this, look at how numberFormatter is used for chart labels and apply it to the tooltip values in renderNormalizedTooltip. There’s currently no merged fix for radar chart tooltips.

To reply, just mention @dosu.

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