public boolean onlyWhenUsingDefaultConfig() {
    return this == ONLY_WHEN_USING_DEFAULT_CONFIG;
  }
Controls whether or not log level updates should be triggered. Default is
{@link #ONLY_WHEN_USING_DEFAULT_CONFIG}.
geode-core/src/main/java/org/apache/geode/logging/internal/spi/LogLevelUpdateOccurs.java