FConcertActivityStream ( [TWeakPtr](API\Runtime\Core\Templates\TWeakPtr)< [IConcertClient](API\Plugins\ConcertClient\IConcertClient), ESPMode::ThreadSafe > InConcertClient, const [FGuid](API\Runtime\Core\Misc\FGuid) & InAdminEndpointId, const [FGuid](API\Runtime\Core\Misc\FGuid) & InSessionId, bool bInIncludeActivityDetails, uint32 InBufferSize )