Jim Severino, from Atlassian’s Internal Systems group, put together an amazing series of blogs and information on how to make Confluence a Business Intelligence and Reporting platform. Here are links to the original blogs (some of the links are a bit out of date) and the roughly equivalent how to pages (most links have been updated ). This is based around many of the plugins developed by /wiki/spaces/info/pages/86083808 and available on this site!  /wiki/spaces/info/pages/86083808 also helped develop the Chart plugin, however, it was not migrated to this site since it is now supported by Atlassian and bundled with Confluence.