Method add

gather/src/main/java/com/example/DemoApplication.java:117–121

(HttpStatus status)

    private long duration;

    public long add(HttpStatus status) {
        AtomicLong value = this.counts.getOrDefault(status, new AtomicLong());
        this.counts.putIfAbsent(status, value);
        return value.incrementAndGet();
    }

    public void stop() {
        this.duration = System.currentTimeMillis() - this.timestamp;