ThreadPoolExhaustedListener 在最新版本中未发现用户配置的入口，这个功能的设计初衷我理解，是发生线程池耗尽通知给应用，目前没看到应用如何添加监听的地方。
String TIME_COUNTDOWN_KEY = "timeout-countdown";
    String ENABLE_TIMEOUT_COUNTDOWN_KEY = "enable-timeout-countdown";
    String REMOVE_VALUE_PREFIX = "-";
    String PROPERTIES_CHAR_SEPARATOR = "-";
    String UNDERLINE_SEPARATOR = "_";
    String SEPARATOR_REGEX = "_|-";
    String GROUP_CHAR_SEPARATOR = ":";
    String HIDE_KEY_PREFIX = ".";
    String DOT_REGEX = "\\.";
    String DEFAULT_KEY_PREFIX = "default.";
    String DEFAULT_KEY = "default";
    String PREFERRED_KEY = "preferred";
    /**
     * Default timeout value in milliseconds for server shutdown
     */
    int DEFAULT_SERVER_SHUTDOWN_TIMEOUT = 10000;
    String SIDE_KEY = "side";
    String PROVIDER_SIDE = "provider";
    String CONSUMER_SIDE = "consumer";
    String ANYHOST_KEY = "anyhost";
    String ANYHOST_VALUE = "0.0.0.0";
    String LOCALHOST_KEY = "localhost";
    String LOCALHOST_VALUE = "127.0.0.1";
    String METHODS_KEY = "methods";
    String METHOD_KEY = "method";
    String PID_KEY = "pid";
    String TIMESTAMP_KEY = "timestamp";
    String GROUP_KEY = "group";
    String PATH_KEY = "path";
    String INTERFACE_KEY = "interface";