Description of problem:
The rule for producing the alert LowKVMNodesCount will never fire the alarm because the rule for this alert: 
(kubevirt_allocatable_nodes_count > 1) and (kubevirt_kvm_available_nodes_count < 2)
the kubevirt_allocatable_nodes_count  counts all nodes as allocatable including the master nodes.
The kubevirt_kvm_available_nodes_count expression is: intstr.FromString("kubevirt_allocatable_nodes_count - count(kube_node_status_allocatable{resource=\"devices_kubevirt_io_kvm\"} == 0)")

This expression will give us 3 so the alert will never fire