Collects all StatsReceivers that are delegated to by the DelegatingStatsReceiver passed as the argument, or if any of those is a DelegatingStatsReceiver, the StatsReceivers they delegate to, recursively.
Collects all StatsReceivers that are delegated to by the DelegatingStatsReceiver passed as the argument, or if any of those is a DelegatingStatsReceiver, the StatsReceivers they delegate to, recursively.
If you think of the StatsReceivers as a tree, it collects the leaves of the tree.