This question is in reference to Atlassian Documentation: Specifying field behavior
how to set validation message for the required field.
For a mandatory field done in field configurations, a red star will appear automatically.
If you're using a validator, then that can return a proper validation message for a field when the check fails, but they can't put anything on the front end - you'll need to put it in the description or use one of the add-ons that can add messages.
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