private RolledUpStatisticEvent buildEvent(final Instant eventTime) {
        return new RolledUpStatisticEvent(StatisticEvent.createCount(
                eventTime.toEpochMilli(),
                "StatAggTest",
                Collections.emptyList(),
                10L));
    }
Useful for injecting stats into SQL_STAT_VAL_SRC, either to manually test aggregation
or to produce data to view in a dash
stroom-app/src/test/java/stroom/statistics/impl/sql/GenerateStatValSourceRows.java