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 APPLICATION_PROTOCOL_KEY = "application-protocol";
    String METADATA_SERVICE_PORT_KEY = "metadata-service-port";
    String METADATA_SERVICE_PROTOCOL_KEY = "metadata-service-protocol";
    String LIVENESS_PROBE_KEY = "liveness-probe";
    String READINESS_PROBE_KEY = "readiness-probe";
    String STARTUP_PROBE = "startup-probe";
    String REMOTE_APPLICATION_KEY = "remote.application";
    String ENABLED_KEY = "enabled";
    String DISABLED_KEY = "disabled";
    String DUBBO_PROPERTIES_KEY = "dubbo.properties.file";
    String DEFAULT_DUBBO_PROPERTIES = "dubbo.properties";
    String DUBBO_MIGRATION_KEY = "dubbo.migration.file";
    String DUBBO_MIGRATION_FILE_ENABLE = "dubbo.migration-file.enable";
    String DEFAULT_DUBBO_MIGRATION_FILE = "dubbo-migration.yaml";
    String ANY_VALUE = "*";
    /**
     * @since 2.7.8
     */
    char COMMA_SEPARATOR_CHAR = ',';
    String COMMA_SEPARATOR = ",";
    String DOT_SEPARATOR = ".";
    Pattern COMMA_SPLIT_PATTERN = Pattern.compile("\\s*[,]+\\s*");
    String PATH_SEPARATOR = "/";
    String PROTOCOL_SEPARATOR = "://";
    String PROTOCOL_SEPARATOR_ENCODED = URL.encode(PROTOCOL_SEPARATOR);
    String REGISTRY_SEPARATOR = "|";
    Pattern REGISTRY_SPLIT_PATTERN = Pattern.compile("\\s*[|;]+\\s*");
    Pattern D_REGISTRY_SPLIT_PATTERN = Pattern.compile("\\s*[|]+\\s*");
    String SEMICOLON_SEPARATOR = ";";
    Pattern SEMICOLON_SPLIT_PATTERN = Pattern.compile("\\s*[;]+\\s*");