@Override
  public void warning(StringId messageId, Object[] parameters, Throwable throwable) {
    if (warningEnabled()) {
      put(WARNING_LEVEL, messageId, parameters, throwable);
    }
  }
Writes both a message and exception to this writer. The message level is "warning".

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