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 Here are links to the original blogs (some of the links are a bit out of date) and the roughly equivalent how to pages (most links have been updated ).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 Bob Swift Software /wiki/spaces/info/pages/86083526 and available on this site! Bob Swift Software/wiki/spaces/info/pages/86083526 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.
How to
Confluence Reporting HOWTO
Confluence Reporting HOWTO - 2. Retrieving Data Into Tables
Confluence Reporting HOWTO - 3. Charts and Formatting
Confluence Reporting HOWTO - 4. Optimizing
Confluence Reporting HOWTO - 5. Dynamic Content
Confluence Reporting HOWTO - 6. Security
Confluence Reporting HOWTO - 7. Examples and Tips