Mark a VS down when 1 pool member is down

There seems to be a less resource-intensive way (for F5) of achieving this:

1. Create as many pool-level health monitors as the pool members, each using an alias IP address representing one pool member;
2. In the "Availability Requirement" field, select "At least", and then enter the minimum number required (e.g. if you have two pool members and you need to set the condition of both being up, enter "2").