MS developer network

Does anyone have a link to documentation or an example that explains/shows how to handle the StatisticUpdateComplete event?
The list of Xbox Live events of interest are:
StatisticEventType::LocalUserAdded
StatisticEventType::LocalUserRemoved
StatisticEventType::GetLeaderboardComplete
StatisticEventType::StatisticUpdateComplete
Thank you.

This is the doc we have on the topic:
https://docs.microsoft.com/en-us/windows/uwp/xbox-live/leaderboards-and-stats-2017/player-stats-updating
and this is the Creators sample we have on the topic:
https://github.com/Microsoft/xbox-live-samples/tree/master/Samples/CreatorsSDK/Leaderboards/UWP/Cpp
But these event's aren't well described in this material. We'll add this to our backlog.