Did a search and couldn't find anything:
https://www.playstation.com/en-gb/legal/gameservers/
Kill Strain is rather recent game, which is a bit disappointing. I don't know if any of these games really have multiplayer modes people enjoyed, but if you liked them or are a trophy hunter you have about two and a half months left to play them.
As of 1 July 2017 you will no longer be able to use the online features of the following games:
PS3
High Velocity Bowling
Medieval Moves: Deadmund's Quest
Sports Champions
Sports Champions 2
PS Vita
Modnation Racers: Road Trip
PS4
Kill Strain
https://www.playstation.com/en-gb/legal/gameservers/
Kill Strain is rather recent game, which is a bit disappointing. I don't know if any of these games really have multiplayer modes people enjoyed, but if you liked them or are a trophy hunter you have about two and a half months left to play them.