What's the right term for the list of "X killed Y with Z" messages in a multiplayer shooter?

I've never heard of "killfeed", but then I haven't been into games in a while. In Quake (the first one) they were called obituaries.

See here for the list of Quake's obituary messages, including such classics as "X rides Y's rocket", "X accepts Y's shaft", and "X chewed on Y's boomstick".

In some games, these messages are known as "Obituaries".

The area where kill notifications are posted is called the "Killboard" in many games including TF2 and Eve Online.

Killfeed is the correct answer however it is a term much that is much older than Cod and probably dates back to quake, I know I knew of it long before COD exsisted. The results you are seeing are biased due to popularity of search terms and lack of inter-generational gaming history. The first COD game was in 2006 and the term kill feed was widely used before then. Google dates the term 'kill feed' back as far as feb 2004 but has no prior data to that. The term 'killfeed' dates back to 2010 where we also see a spike in usage of 'kill feed'. This corresponds with the release of COD: Black Ops.

Another example of this bias from an article saying Starsiege:Tribes has a notable kill feed with custom messages e.g. 'Player A blasts Player B with the Spinfusor'. However the quake series did this first including custom environmental deaths 'PlayerName Melted' when you fall in lava for example.

Its possible its as old as Doom!

I usually call that a "killfeed" as well, but have also heard it referred to as the "log". This makes sense, as it documents what's been happening in the game.