How would your/the filter expression look like if ($API_URL/domain-types/host/collections/all) the host should be:
currently not UP (state != 0)
not being acknowledged (acknowledged = 0)
not having any downtime set ???
I understood, that downtimes are logically connected to the host object via the downtime ID but is there any filter for the hosts? (I am currently not interested in any more details - just if a downtime is set).