The rigging failures I have seen were:
- toggles (3x - the flat/plate toggles),
- wire failure just above/below swagged terminal (2x),
- backing plates
- chainplates (3x).
Replace and check your rigging and all associated hardware
with generally recommended frequency and you are standing a very good chance of avoiding any rigging failure. Alignment and proper sizing are of paramount importance.
If it is a new (to you) boat you may resolve to replace all standing rigging (and associated mast/deck hardware) but this seems only worth it if you are going for an out and out cruising route
- far offshore
and far from any service
If in doubt, hire a local rigger and have them review everything and deliver a written report/opinion to you.