It is a dashboard with a graph that has 2 calculated items. The calculated items are quite similar. One shows the total disk pool size and the other is the free space on that pool of disks. 

When I create the graph with only the free space its fine. When I add total space it kicks off a   php-fpm8.2 process with 100% cpu usage. When I create a graph with just the total pool size it also doesn't work.  It does this for every user that tries to view the graph.

The issue started after upgrading from 6.4 to zabbix 7. 

The weird thing is when I'm configuring the graph it some times works. But as soon as it is saved and the time window is changed it starts to have the same behavior again.