This is not going to be pretty. Likely mostly a re-implementation given the way everything was coded to use regexes that depend on the old locator and keys in specific orders. We need a new way to define matchers that uses structured intervals.

We also have some very complex logic around hashing the message to get it into the locator. Possible duplication between watchevents/event.go and duplicated_events.go.

Will be quite delicate and probably very time consuming.