Currently the Google Analytics plugin for Atlassian Confluence Cloud is for free, but eventually we would have to switch it to a paid version, due to the costs associated. 

Before the plugin is switched to a paid version, we will certainly give you a fair amount of notice. In addition, we do not intent to charge the plugin at a high price, rather to cover its costs. Therefore, it will not be an expensive product. 

Access our Atlassian Marketplace and download the Confluence Cloud Google Analytics Plugin.  

Have lots of fun and give us feedbacks here!