HowTo: Run a hook when a buffer becomes "current"

[raman]

I was looking for a way of running a function  when a buffer becomes
"current". I cant find any hooks in Emacs -- the closest is
buffer-list-update-hook -- but that gets called way too often including
when a buffer is buried, is visited transiently from within lisp code
etc.

Is there a hook that I'm missing, or  is advice the only fallback I have?
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