For anyone playing Call of Duty: Warzone on PC, you are probably well-aware of the consistency of connections. Most days, they are without interruption. But, doing a quick search on the internet for known system outages reveals a much more widespread problem. And, for instances like today, it seems that Battle.net services are being interrupted due to a DDoS attack. This type of disruption aims to down servers and connectivity, which, it seems to have been successful in the case of the Battle.net launcher.
Wait times
You might not have experienced a queue for services on Battle.net before. But, for the uninitiated, when traffic is at a peak, waiting players are then siphoned into a queue where they must wait in order to login to Battle.net servers. In the case of the attack, it has booted people from games (myself included), and overloaded login times. At the time of writing this, there was a 130-minute wait to log back into Activision servers for Call of Duty: Warzone. It is unknown at this time if the attack is isolated to PC servers or geographic region.
Other attacks
For anyone looking to check on global services of a specific provider, you can always check this website to see if others are experiencing similar problems.