private void decimalsOfSecondsFromMilliseconds(long ms, StringBuilder sb) {
        long dec = ms % 1000;
        String numbers = String.valueOf(dec);
        if (dec <= 9) {
            sb.append("00");
        } else if (dec <= 99) {
            sb.append('0');
        }
        sb.append(numbers);
    }
@author Bjorn Borud
@author Oyvind Bakksjo
container-core/src/main/java/com/yahoo/container/logging/VespaAccessLog.java