Determine if a particular action in Drupal 7 Rules 2 is part of any active rule.

Determine if D7 Rules action is active

$action_name = 'r2d2';
$rules = rules_config_load_multiple(FALSE);

foreach ($rules as $rule) {
  if (get_class($rule) == 'RulesReactionRule') {
    foreach ($rule->actions() as $action) {
      if (get_class($action) == 'RulesAction') {
        if (($action->getElementName() == $action_name) && ($rule->active == 1)) {
          return 'that was the droid you were looking for';
        }
      }
    }
  }
}