You will have to restore an old (automatic generated or not) import of your instance. You can do it using JIRA's .xml file or a database backup file. I believe these are the only ways to restore data lost and both need the backup file of when the information was in your instance. I hope you have one of these!
The .xml file of JIRA should be located in JIRA_Home/export/
I’m a designer on the Jira team. For a long time, I’ve fielded questions from other designers about how they should be using Jira Software with their design team. I’ve also heard feedback from other ...
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