In each member's profile page there are some metrics displayed, such as Answers and Total Posts.
https://community.atlassian.com/user/profile/326ffd46-464f-4bd4-ac58-0baf819abc3a
And there is a separate page displayed if you click on the link for Total Posts with more metrics listed under Analytics and under Activity.
https://community.atlassian.com/forums/profile/discussions/3569011
It would be nice to have a FAQ that explains the source data for those metrics.