What constants do I need to define in wp-config.php?

Q. What constants do I need to define in wp-config.php for debugging with oik-bwtrace?
A. None are necessary, but some are recommended. When you’re debugging WordPress you should always set WP_DEBUG to true so that you see PHP Notices, Warnings, Errors and Fatal errors. Here are some recommended settings for wp-config.php

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error_reporting( E_ALL );
define( 'WP_DEBUG', true );
if ( defined( 'WP_DEBUG' && WP_DEBUG ) ) {
  define( 'WP_DEBUG_LOG', true);
  define( 'WP_DEBUG_DISPLAY', true );
}
define( 'SAVEQUERIES', true );
define( 'SCRIPT_DEBUG', true );
define( 'JETPACK_DEV_DEBUG', true);
 

Note: oik-bwtrace is not dependent on these settings. If you want to start tracing from wp-config.php then see: Start tracing from wp-config.php