static LogLevelUpdateOccurs getLogLevelUpdateOccurs() {
    try {
      return LogLevelUpdateOccurs.valueOf(System.getProperty(LOG_LEVEL_UPDATE_OCCURS_PROPERTY,
          ONLY_WHEN_USING_DEFAULT_CONFIG.name()).toUpperCase());
    } catch (IllegalArgumentException e) {
      return ONLY_WHEN_USING_DEFAULT_CONFIG;
    }
  }
Protected by synchronization on Configuration instance.
geode-core/src/main/java/org/apache/geode/logging/internal/Configuration.java