要約

When a Jira issue is deleted, it is removed from the database and can no longer be accessed or viewed. Atlassian backups cannot be used to restore issue data. 

Restore deleted issues from local backup files

At this time, it is only possible to restore accidentally deleted data to Jira Cloud if you have an existing backup file to import via the steps outlined in the Import Issues documentation.

1. Restore XML backup (from before the issue was deleted)
2. Export the issue, 
   1. Instructions found here: Exporting search results to excel
3. エクスポートされた Excel を CSV に変換します。
4. Import the CSV data
   1. Instructions found here: Importing data from csv

Manually recreate the issue by piecing together notification information

If there is no exported backup file to use, you may be able to manually create the issue with the same information it had originally.
To find that information, you can review the notification scheme which is configured for the project. When an issue has been created, deleted, and updated, the notification will be sent to the added users on the respective tickets.  By default, Jira sends issue created notifications to these users:

• すべてのウォッチャー
• 現在の担当者
• 報告者

You can check with users belonging to this project, to see if they have a copy of the notifications in their inbox. Please note, this will mean you have a different issue key number.

You can also check for add-ons available in the marketplace to restore the deleted issues. This will not allow you to restore issues that were deleted before add-ons were installed, but can help in future instances.

We have an ongoing feature request to implement a recycle bin like component which would allow recovering deleted Issues and various other JIRA data that would work as a safety net for such incidents in the future. JRACLOUD-36415 - Getting issue details... STATUS