Datadog event trigger returns no data instead of 0

问题

I have created a event monitor( for example

events('sources:rds event_source:db-instance').by('dbinstanceidentifier').rollup('count').last('1d') >= 1)

but it returns "NO DATA" when there are no any events.

How to make it return 0 when there are no any events?

来源：https://stackoverflow.com/questions/58873617/datadog-event-trigger-returns-no-data-instead-of-0