本文转自： https://support.atlassian.com/jira-software-cloud/docs/flag-an-issue/
You can flag an issue to indicate that it's important.
The card of a flagged issue is displayed in yellow in the Scrum backlog, Active sprints of a Scrum board, Kanban backlog (if enabled),
and Kanban board, with the 'flag' icon replacing the priority icon.
Flagging or unflagging an issue
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Go to your board or backlog
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Select an issue and click
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> Add flag
Searching for flagged issues
The flag for an issue is stored in a custom checkbox field called "Flagged", which has only one value: Impediment. Use the JQL query Flagged = Impediment to find flagged issues.