BattleArena, as of 184.108.40.206+, uses the BattlePluginsAPI system, this allows certain functionality to be included to talk with the website for pasting config files by in game command, and in the future potentially error logs.
Alongside this functionality certain statistics are also collected.
The statistics can be seen here.
This can be disabled in BattlePluginsAPI/config.yml file.
We are still working out the kinks. The statistics may randomly be wiped or tracking patterns my change within the upcoming days. These changes should not occur as often after two weeks from today.