dont you hate it when TTL isnt enough for cache invalidation? its a real pain.

hey foks im runing into a comon cashing prob. weve got a bunc of data that is red frecantly but updated ocaionally. using a simple ttl is fine for most of it but there are a few critical peices where stale data for even a few mintues is a big no no. what are your go to pterns for cach invaldation beyond just time to live. any thots on event driven invaldation or other aproches