@Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            Group group = (Group) o;
            return members.equals(group.members) && memberRegions.equals(group.memberRegions) && deadline.equals(group.deadline);
        }
Returns the max time until the other regions must be able to handle the additional traffic
when a region becomes unreachable, which by default is Duration.ZERO.
config-model-api/src/main/java/com/yahoo/config/application/api/Bcp.java