in visualization type, the radar chart is need for analysis.
like plotly radar chart Radar Charts in Python
and i know how to contribute the visualization type code for redash, please give me the development link that tell newbies how to add add a new visualization type in the codebase of redash.
I don’t think the “how to add a visualization” docs have been updated since the move to React 
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When can we expect stable release of 9.0 version?
Any progress guys with radar chart in Redash?
Nobody on the core team is implementing this chart (yet).
V10 release is a couple weeks out. After that we’ll update our “Add a Visualization” guide. From there anyone in the community could contribute it. In the coming months we’ll implement a more transparent process for what features are being worked on by the core team.