dump_meta_keys.php

<?php

add_action('genesis_before', function() {

    global $wpdb;
    $post_type = 'product';
    $query = "
        SELECT DISTINCT($wpdb->postmeta.meta_key) 
        FROM $wpdb->posts 
        LEFT JOIN $wpdb->postmeta 
        ON $wpdb->posts.ID = $wpdb->postmeta.post_id 
        WHERE $wpdb->posts.post_type = '%s' 
        AND $wpdb->postmeta.meta_key != '' 
        AND $wpdb->postmeta.meta_key NOT RegExp '(^[_0-9].+$)' 
        AND $wpdb->postmeta.meta_key NOT RegExp '(^[0-9]+$)'
    ";
    $meta_keys = $wpdb->get_col($wpdb->prepare($query, $post_type));
    dump($meta_keys);

});

?>