In order to enable debug logs for the Powered Cache, you can add example configurations to your wp-config.php file
define( 'POWERED_CACHE_ENABLE_LOG', true ); 
define( 'POWERED_CACHE_LOG_FILE', dirname( __FILE__ ) . '/log.txt' );- We don’t recommend enabling logging on production websites.
- Make sure the log file is out of the public directory, or access restricted to that file.
- If you don’t define  POWERED_CACHE_LOG_FILEthe logs will be send to standard stream that error_log uses.
- You can define POWERED_CACHE_LOG_IPfor the enable logging only for the particular IP address.