Returns statistics about data late fragments. A fragment is late if, due to the event ordering accumulation window, it must be emitted out of order. Specifically, if the timestamp of a fragment is earlier than the the timestamp of the fragment most recently sent to the output stage, the fragment is late.
The command takes no additional command parameters and returns a list consisting of the following elements:
The number of fragments that have been received late.
The worst time difference between a late fragment and the most recently output fragment.
A list for each data source that contains
The source id
The number of late fragments from that source
The worst case time difference from that source