Aurora: Member metrics for ranking formulas
You can include any permember metrics in your ranking formulas. However, you cannot use perpost metrics or metrics that relate to general areas of the community, like groups.
You can include any of the following member metrics as variables in your ranking formulas.
Note: This is not a complete list but rather a list of the more common member metrics that you may consider using in your formulas.
Accepted solutions 

accepted_solutions 
The member’s total number of accepted solutions. This number includes any accepted solutions that might have been revoked. See also net_accepted_solutions. 

net_accepted_solutions 
The member’s total number of solutions that were accepted during a period minus those that were revoked during the same period. 

net_other_solved_accepted_solutions 
The member’s total accepted solutions to someone else’s question minus those that were revoked during the same period. 

net_self_solved_accepted_solutions 
The member’s total accepted solutions to the member’s own questions minus those that were revoked. 

author_accepted_solutions 
The total number of solutions accepted by the author. 

author_revoked_solutions 
The total number of solutions that were revoked by the question's author. 

mod_accepted_solutions 
The total number of posts written by any member that were marked by a moderator as solutions. You can view this metric for specific moderators or for all moderators. 

mod_revoked_solutions 
The number of times a moderator has revoked an accepted solution. 

net_solved_threads 
The number of solved discussions started by a member minus the number of solved discussions started by the same member or that were revoked. This is the net change in the number of solved discussions started by this member. 

net_solved_threads_to_net_threads ratio 
The number of net solved discussions divided by the number of net discussions. Note: This ratio is not cumulative; it covers activity only during the period selected. The longer the period, the more useful this metric is likely to be. 

solution_revoked_threads 
The number of times solutions written by any member were later revoked. 

solutions_marked 
The number of times the member has marked a post as a solution. 

solutions_unmarked 
The number of times the member has revoked a post marked as a solution. 

solved_threads 
The number of times discussions written by any member have been marked as solved. 

other_solved_accepted_solutions 
The member’s total number of solutions to someone else’s questions that were accepted by anyone in the community. 

other_solved_revoked_solutions 
The member’s total number of solutions to someone else’s question that were revoked. 

revoked_solutions 
The member’s total number of accepted solutions that were revoked. 

self_solved_accepted_solutions 
The member’s total number of solutions to the member’s own questions that were accepted by anyone in the community. 

self_solved_revoked_solutions 
The member’s total number of solutions to the member’s own questions that were revoked. 
Blog activity 

blog_page_views 
The number of times a member has viewed blogrelated pages. 

blog_article_views 
The number of times a member has viewed blog articles. 

blog_articles 
The number of articles a member has posted to blogs. 

blog_comments 
The number of comments that a member has posted to blogs. 
General community activity 

logins 
The number of times the member has signed in to the community. 

minutes_online 
The total number of minutes the member has been logged in to the community. 

video_upload_complete_count 
The number of videos a member has successfully uploaded to the community. 

image_upload_count 
The total number of images a member has uploaded to the community regardless of their size. 
Content metrics 

posts 
The total number of discussion posts—both new discussions and replies—the member has posted. This includes any posts that have been deleted. You may want to calculate the net number of posts by subtracting deleted posts. See also deleted_posts. 
overall_posts 
The overall number of posts across all types of content (forums, blogs, etc.) Metric results for custom date ranges reflect the time zone defined in your profile. Administrators who have set a different time zone in their profile see different metrics results for these custom date ranges. 
replies 
The number of replies to content the member has posted. This includes any replies that have been deleted. You may want to calculate the net number of replies by subtracting deleted replies. 
threads 
The total number of new discussions the member has started. This includes any discussions that have been deleted. You may want to calculate the net number of discussions by subtracting deleted ones. 
totalposts_per_thread 
The total number of posts a member posted divided by the number of discussions the member started during the same time interval. 
deleted_posts 
The number of the member’s posts that have been deleted. 
deleted_threads 
The number of discussions the member has started that were also deleted. 
net_contributed_posts 
The number of contributed or linked posts minus the number of contributed or linked posts removed. 
Tagging activity 

tagging_avg_tags_per_message 
The average number of tags the member has applied across all posts. 

tagging_tag_count 
The total number of tags the member has applied. 
KB activity 

published_tkb_articles 
The number of KB articles a member has published. 

tkb_articles 
The number of KB articles a member has started. 

tkb_comments 
The number of comments a member has posted to a KB. 

nominated_messages 
The number of posts that a member has made that have been nominated to be included in a KB. 
Viewing metrics 

board_views 
The number of times a member viewed the overview page for a forum. 

message_views 
The number of posts the member has viewed. 

page_views 
The number of community pages the member has viewed. 
Likes 

kudos_events_received 
The number of times this author's posts have received Likes. 

kudos_events_received_revoked 
The number of times this author's Likes have been revoked. 

net_kudos_events_received 
The number of times this author's posts have received Likes minus the number of times this author's Likes have been revoked. 

kudos_weight_received 
The sum of the Likes weight for this author's posts that have received Likes. 

kudos_weight_revoked 
The sum of the Likes weight for this author's posts that have had Likes revoked. 

kudos_events_given 
The number of times this member gave Likes. 

kudos_events_given_revoked 
The number of times Likes given by this member were revoked. 

net_kudos_events_given 
The number of times this member gave Likes minus the times Likes given by this member were revoked. 

kudos_weight_given 
The sum of the Likes weight for Likes this member gave. 

net_kudos_weight_given 
The sum of Likes given minus the sum of Likes that were revoked. Likes here are measured by the net Likes weight for this member. 

net_kudos_weight_received 
The sum of Likes this author received minus the sum of Likes that were revoked. Likes here are measured by the net Likes weight for this member. 
In addition to the member metrics, you can add these special variables in your ranking formulas.
contributionScore 
Overall knowledge base contribution score. 
registrationAge 
The number of minutes since the member registered in the community. 
userId 
The numeric ID associated with a member account. 
userInfo  Include a custom field that is present on your user entity. 
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