private ImmutableMap.Builder<State, Event> builderWithout(State type) {
            ImmutableMap.Builder<State, Event> builder = ImmutableMap.builder();
            events.forEach((t, at) -> {
                if (t != type) {
                    builder.put(t, at);
                }
            });
            return builder;
        }
A recording of the most recent time of each state change
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/backup/Snapshot.java