@Override
  public void configure(final LogConfig logConfig, final LogLevelUpdateOccurs logLevelUpdateOccurs,
      final LogLevelUpdateScope logLevelUpdateScope) {
    if (shouldUpdateLogLevels(logLevelUpdateOccurs)) {
      Level loggerLevel = toLevel(LogWriterLevel.find(logConfig.getLogLevel()));
      updateLogLevel(loggerLevel, getLoggerConfig(MAIN_LOGGER_NAME));

      Level securityLoggerLevel = toLevel(LogWriterLevel.find(logConfig.getSecurityLogLevel()));
      updateLogLevel(securityLoggerLevel, getLoggerConfig(SECURITY_LOGGER_NAME));

      if (!LogConfig.hasSecurityLogFile(logConfig)) {
        configuredSecurityAppenders =
            configureSecurityAppenders(SECURITY_LOGGER_NAME, securityLoggerLevel);
      }
    }

    if (shouldUpdateLogLevels(logLevelUpdateOccurs)) {
      updateLogLevel(logConfig, logLevelUpdateScope);
    }

    configureFastLoggerDelegating();
  }
Name of variable that is set to "true" in log4j2.xml to indicate that it is the default geode
config xml.
geode-log4j/src/main/java/org/apache/geode/logging/log4j/internal/impl/Log4jLoggingProvider.java