To lock a job, click the Completed tab in the Jobs panel, select a build, and then click Lock.
To unlock a job, click the Locked tab in the Jobs panel, select a locked build, and then click Unlock.
The system does not purge a locked job automatically (such as when the class purge properties for the run call for it to be deleted). You can still delete a locked job manually.
Click the Locked tab to view jobs that are in the locked state. Such projects do not appear in the Completed page.