If I for instance like to have the attention of people in the group "qa" it would be good if I can write that instead of all the names individually. Can this be done or is there a plugin for this?
As far as I know it's not possible with the current JIRA releases: you can not mention @all (all participants / watchers) or @group (all people in the given group) in the JIRA.
As for a plugin - I'm not aware of any either. You could browse the Atlassian Marketplace. Some vendors or just enthusiasts could have implemented this.
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