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1771e673d2
* Prevent underscore character being used in 'name'. * Restrict underscores in hostnames, not all names. * Use hostname validator for node name. * Allow underscore in hostname but warn once. * Add renaming instructions link to warning. * Point underscore warning to FAQ section Co-authored-by: Otto Winter <otto@otto-winter.com> Co-authored-by: Otto Winter <otto@otto-winter.com>