private boolean hasAppenderFilter(final Configuration config) {
    for (Appender appender : config.getAppenders().values()) {
      if (appender instanceof AbstractFilterable) {
        if (((Filterable) appender).hasFilter()) {
          return true;
        }
      }
    }
    return false;
  }
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