public static ConfigService getInstance() {
        if (configService == null) {
            synchronized (ConfigService.class) {
                if (configService == null) {
                    configService = new ConfigService();
                }
            }
        }
        return configService;
    }
If there is no audit item configured in the service configuration table audit_id_config, the default audit item is used.
Audit id 3 means that the Agent receives successfully.
Audit id 4 means that the Agent sends successfully.
Audit id 5 means that the DataProxy receives successfully.
Audit id 6 means that the DataProxy sends successfully.
inlong-audit/audit-service/src/main/java/org/apache/inlong/audit/service/node/ConfigService.java