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                        New action: flagged as duplicate
see subject
How does one "flag as duplicate"?
By adding a label? Wouldn't added_label work then?
You write "Duplicate of #XXX" and Github adds a new "Timeline item", c.f. https://help.github.com/articles/about-duplicate-issues-and-pull-requests/ . But it looks like this item is currently not exported through the API, see https://platform.github.community/t/schema-request-un-marked-as-duplicate-timeline-events/5099

Oh, interesting - didn't know this functionality. Thanks!