History QoS

Is a QoS policy that specifies the number of samples kept by the middleware engine. data_distribution_service_dds will only attempt to keep the most recent ‘depth’ of samples (KEEP_LAST) or ALL samples (KEEP_ALL) of each instance of data identified by its [ddsf:private:cookbook:06_append:glossary:k:key|key]].

Source: OpenSplice Glossary