Steps to reproduce:

1. create a template1 with items for log metric
2. add template1 to 10 hosts in group Nginx Log Calculation
3. create a template2 for aggregate items of template1
4. the item is : sum(last_foreach(/*/requests[all,log1]?[group="Nginx Log Calculation"]))
5. add template2 to a virtual host with no interface
6. it must calculate sum the last value of last min of every server

Result:
normally it works fine with no error

when every of hosts go down the last value of the host is invalid because it is not value in last minute but zabbix calculate the value so the sum of all vale is incorrect until i disable the host in zabbix configuration.

Expected:
i think zabbix should  behave unavailable hosts as same as disabled hosts in the aggregation items