public static SuspensionLimit fromAllowedDownRatio(double allowedDownRatio) {
        return new SuspensionLimit(0, allowedDownRatio);
    }
@author hakonhall

@param allowedDown      the maximum number of services (nodes) that are allowed to be down.
@param allowedDownRatio the maximum ratio of services (nodes) that are allowed to be down.
orchestrator/src/main/java/com/yahoo/vespa/orchestrator/policy/SuspensionLimit.java