private static String createMessage(int code, String description) {
        return String.format("Received error from ZTS: code=%d, message=\"%s\"", code, description);
    }
An exception that can be thrown by {@link ZtsClient} implementations.

@author bjorncs
vespa-athenz/src/main/java/com/yahoo/vespa/athenz/client/zts/ZtsClientException.java