RAG Staleness happens when old source files make RAG give old answers.
It is like using last year's school lunch menu. You expect tacos. It is mystery casserole day.
Old files can make RAG give old answers. Update the files and search index, especially for prices and rules.
RAG
RAG uses outside files, so old files can make its answers old.
Knowledge Cutoff
Knowledge Cutoff means old model memory. RAG Staleness means old outside files.
Vector-db
A Vector-db can still return an old document during a search.