public String toHumanReadableString(int totalNodes) {
            return String.format("Max %.0f%% (%d) or %d nodes can fail over a period of %s", fractionAllowedToFail*100,
                                 allowedToFailOf(totalNodes),
                                 minimumAllowedToFail, throttleWindow);
        }
Returns true if node failing should be throttled
node-repository/src/main/java/com/yahoo/vespa/hosted/provision/maintenance/NodeFailer.java