Have you checked Link Monitoring under Device > High Availability it has the condition of "Any" or "All" under link-group as shown below:
The above will cause failover if either ethernet1/3 or ethernet1/4 go down.
Any -> if any of the interfaces go down on active device a failover will occur
All -> only when all the interfaces go down failover will occur
You can configure that with Link monitoring. There is another option as well for path monitoring. If you are looking for option for interface then link monitoring is what you are looking for.
Here in snapshot above, I have asked firewall to monitor both ethernet 11 and 12 and if "Any" of the interface goes down, it will cause a failover. You can also configure "All" , that would mean if both 11 and 12 goes down then only failover will occur. Hope this helps. Thank you.
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