When using Monitored circuit VRRP, what is a priority delta?

When using Monitored circuit VRRP, the priority delta is the value that is subtracted from the priority of a cluster member when one of its monitored interfaces fails2. For example, if the priority of a cluster member is 100 and the priority delta is 10, then when one of its monitored interfaces fails, its priority becomes 90. References: Check Point R81 ClusterXL Administration Guide