What is it? The 2.23 patch installed Blizzards program called Warden
What does it do? What dosnt it do! It trys to stop hacking, Host bots, Chat bots, Channel bots, Soon Maphacks, Ect.
How to get rid of it? There is no way to get rid of it at this time, Me and some friends...
Spoiler:
What should you do? Nothing, just act as you normally do!