HomeKit critical alerts device_class(es)

I primarily use my iPhone to manage HA via HomeKit, works great. I have a a binary sensor alert if our doors are left open for xx minutes and if the refrigerator temp is too high (ie door left open). However, I’d like to set these as critical alerts so our iPhones are always alerted with an alarm.

I have several leak sensors that work great (device_class: moisture) that come up as critical alerts. What other options aside from ‘moisture’ can I use for these other alarms in HomeKit? I’ve tried device_class: problem and safety and neither worked. Any help appreciated.

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