Merge pull request #14308 from woocommerce/add/14304

Add backtrace to deprecated message

includes/wc-deprecated-functions.php

@@ -59,6 +59,8 @@ function wc_deprecated_function( $function, $version, $replacement = null ) {
  * @param  string $replacement
  */
 function wc_doing_it_wrong( $function, $message, $version ) {
+	$message .= ' Backtrace: ' . wp_debug_backtrace_summary();
+
 	if ( is_ajax() ) {
 		do_action( 'doing_it_wrong_run', $function, $message, $version );
 		error_log( "{$function} was called incorrectly. {$message}. This message was added in version {$version}." );