void FilterManager::callHighWatermarkCallbacks() {
  ++high_watermark_count_;
  for (auto watermark_callbacks : watermark_callbacks_) {
    watermark_callbacks->onAboveWriteBufferHighWatermark();
  }
}
void FilterManager::callHighWatermarkCallbacks() {
  ++high_watermark_count_;
  for (auto watermark_callbacks : watermark_callbacks_) {
    watermark_callbacks->onAboveWriteBufferHighWatermark();
  }
}