Hello, my name is John Su. Welcome to my homepage. I'm a senior technical director, technical artist, game engineer, VFX artist, and art-lover.
by John
When I right clicked in my ABP eventgraph, under “Add Anim Notify Event” there are couple of actions:

It troubled me that I could not trace where they are coming from: just not from anywhere in the whole project.
GPT was not much help in this case. I managed to dug into the
Engine\Source\Runtime\Engine\Private\Animation\Skeleton.cpp, and in
void USkeleton::CollectAnimationNotifies(TArray<FName>& OutNotifies) const it indicates that it’s from the skeleton
animation notifies.
But I couldn’t find any notifiers.
Finnally, I found that even the notifiers are not referenced anymore, they still show up in the event graph action list. To manage them, you need to use the “Manage Notifiers” menu:
