code: @Override
    public Object eval() {
      logger.info("Checking sla for execution " + this.execId);
      final ExecutableFlow flow;
      try {
        flow = this.executorLoader.fetchExecutableFlow(this.execId);
      } catch (final ExecutorManagerException e) {
        logger.error("Can't get executable flow.", e);
        e.printStackTrace();
        // something wrong, send out alerts
        return true;
      }
      return isSlaMissed(flow);
    }
docs: return true to trigger sla action