@Override
  public void config(StringId messageId, Object parameter, Throwable throwable) {
    if (configEnabled()) {
      put(CONFIG_LEVEL, messageId, new Object[] {parameter}, throwable);
    }
  }
Writes both a message and exception to this writer. The message level is "config".

@since GemFire 6.0
geode-core/src/main/java/org/apache/geode/internal/logging/LogWriterImpl.java