I want to know why Stats → Issues is empty even though I have accepted events in the selected time range.
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Stats → Issues is for team triage analytics, not org-wide event volume. It’s available only on Business and Enterprise plans.

It counts issues assigned to the selected team. An issue that belongs to a project your team owns but isn’t assigned to that team won’t appear there.

Confirm you’re on Business or Enterprise. Then, in Stats → Issues, select the correct team and date range. If you expect certain issues to appear in the charts, assign them to that team manually, through ownership rules, or through CODEOWNERS.

For accepted event volume, use Stats → Usage. See Issues Stats and How can I see team analytics?.