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Running the testHistogramSerial test with VTK_DEBUG_LEAKS enabled will show the leaks. The leak is in VTKDataAdaptor::GetMesh():

//----------------------------------------------------------------------------
int VTKDataAdaptor::GetMesh(const std::string &meshName, bool structureOnly,
  vtkDataObject *&mesh)
{
  vtkDataObject *dobj = nullptr;
  if (this->GetDataObject(meshName, dobj))
    {
    SENSEI_ERROR("Failed to get mesh \"" << meshName << "\"")
    return -1;
    }

  if (vtkCompositeDataSet *cd = dynamic_cast<vtkCompositeDataSet*>(dobj))
    {
    vtkCompositeDataSet *cdo = cd->NewInstance(); ---------------------- maybe a memory leak
    cdo->CopyStructure(cd);

    vtkCompositeDataIterator *cdit = cd->NewIterator(); ------------------------ probably a memory leak
    while (!cdit->IsDoneWithTraversal())
      {
      vtkDataObject *dobj = cd->GetDataSet(cdit);
      vtkDataObject *dobjo = dobj->NewInstance(); ---------------------- maybe a memory leak
      if (!structureOnly)
        {
        if (vtkDataSet *ds = dynamic_cast<vtkDataSet*>(dobj))
          {
          vtkDataSet *dso = static_cast<vtkDataSet*>(dobjo);
          dso->CopyStructure(ds);
          }
        }
      cdo->SetDataSet(cdit, dobjo);
      cdit->GoToNextItem();
      }

    mesh = cdo;
    return 0;
    }

  if (vtkDataSet *ds = dynamic_cast<vtkDataSet*>(dobj))
    {
    vtkDataSet *dsOut = ds->NewInstance();  ------------------- definitely a memory leak

    if (!structureOnly)
      dsOut->CopyStructure(ds);

    mesh = dsOut;
    return 0;
    }

  SENSEI_ERROR("Unsupoorted data object type " << dobj->GetClassName())
  return -1;
}