Requirement Yogi uses notifications in the top bar during the "onboarding":
...
At each period, a link to the "onboarding checklist" is provided:
After 3 days, notify administators of the Confluence instance about the plugin installation (if fewer than 10 requirements have been created),
After 8 days, notify administrators who haven't completed 80% of the checklist,
After 25 days, notify administrators about the number of created requirements (if the license isn't purchased yet),
After 80 days, notify administrators that they can leave a review (if they have purchased a license).
In addition:
Administrators can click a button in the administration to automatically notify all users of the instance.