public function onManagerStart(Server $server): void
    {
        // $server->manager_pid;
        $this->fire(ServerEvent::MANAGER_STARTED, $server);

        // file_put_contents($this->pidFile, ',' . $server->manager_pid, FILE_APPEND);
        ServerUtil::createPidFile($server->manager_pid, $this->pidFile);
        ProcessUtil::setTitle("{$this->name}: manager");

        $this->log("The <comment>manager</comment> process success started. (PID:{$server->manager_pid})");
    }