Chapter 10 Install and System Administration for FortiOS 5.0 : FortiCloud : Registration and Activation : Enabling logging to FortiCloud : Configuring policies 5.0
  
Configuring policies 5.0
After enabling logging functionality, you will need to select which policies will be logged.
1. Open the Policy list.
2. Choose the policy you would like to log, and select Edit.
3. Check the box next to Log all sessions.
4. Select OK.