core/src/main/java/com/orientechnologies/common/log/OLogManager.java
public void applyStorageFilter() {
    final StorageFilter filter = new StorageFilter();

    if (storageFilterHolder.compareAndSet(null, filter)) {
      for (Logger logger : loggersCache.values()) {
        logger.setFilter(filter);
      }
    }
  }
public void applyStorageFilter() {
    final StorageFilter filter = new StorageFilter();

    if (storageFilterHolder.compareAndSet(null, filter)) {
      for (Logger logger : loggersCache.values()) {
        logger.setFilter(filter);
      }
    }
  }
Start filter out all messages which are logged using {@link #errorStorage(Object, String, Throwable, Object...)} method.