public function getStats()
{
return ['no-custom-stats' => [1, 2, 3, [], '{"numImages":1,"numUsers":2,"numBytes":3,"custom":{}}'], 'custom-stats' => [4, 5, 6, ['foo' => 'bar', 'bar' => ['foobar' => 'foooo']], '{"numImages":4,"numUsers":5,"numBytes":6,"custom":{"foo":"bar","bar":{"foobar":"foooo"}}}']];
}