presto-main/src/main/java/io/prestosql/execution/TaskManagerConfig.java/TaskManagerConfig/setTaskNotificationThreads
class TaskManagerConfig:    @Config("task.task-notification-threads")
    @ConfigDescription("Number of threads used for internal task event notifications")
    public TaskManagerConfig setTaskNotificationThreads(int taskNotificationThreads)
    {
        this.taskNotificationThreads = taskNotificationThreads;
        return this;
    }