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It looks like in this PR we updated the slug function to remove anything that is not a character, number, or hyphen. I think we should also allow underscores in the slug.
The wiki article mentions that underscores or hyphens would be appropriate in a slug.
A number of users here currently use underscores in slugs, especially for the templated links in the time table viz (like /superset/dashboard/dashboard_{{metric }}) where the metric would have an underscore). So when they edit dashboards the underscores get removed and their links no longer work.
@mistercrunch @john-bodley