I am afraid but there is no straight way to do the restore of deleted Issue type.
May be if you have a backup, you can set up a new test instance with old data where you had needed tasks. You can then try to move all Epics from test instance to another test instance that doesnt have the issue type.
I havent tried anything of that sort and see it as a tidious task.
Database merge might also be an option. But its more complicated to get all entried relavent to an Issue type in the DB. But it can be worth a try if its very critical.
By the way did you try to re-install JIRA Agile, it might create the missing issuetype again I guess.
You will need to delete the rest of the issue type created by Agile which has "Created by JIRA Agile - do not edit or delete.xxx ". Once done, go to manage add on, you will see agile become disable. Enable it back, and JIRA Agile will recreate these issue type. However, the impact on this is unknown as the new issue type ID will be different, thus, may impact on your existing/closed issue.
Please do not delete these issue type in any means if possible as it can result to your JIRA Agile report to become haywire.
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