In the Application Page for your RUM app, at the top right you should see a "..." button . Click on Edit and go to General. You should see at the bottom of the page "Cost and traffic control" allowing you to choose the % of user sessions to be captured. You can select how much user sessions should be captured to manage your license. You can not set a monthly limit or annual limit per application.The Cluster Management console lets you set these limits for the entire tenant monthly or annually.