If you have Cloud Analytics enabled, you will be able to view these metrics by going to Global Reach within the particular document you are looking at:
This will allow you to see the impact metrics (Views, Comments, Likes, Shares, Bookmark):
Or if you are interested in using the Data Export Service to create your own reports, those events are filterable as shown here https://community.jivesoftware.com/docs/DOC-99916#jive_content_id_List_of_All_Data_Export_Events
This document can be helpful for pulling data Extracting data from Cloudalytics using a Rest Client
If you do not have analytics enabled you will want to create a case in your private support group, requesting Cloud Analytics to be enabled for your site and our support engineers will begin the approval process.
Hope this helps.