public static void setup(MeterRegistry registry, MeterIdPrefix idPrefix, Cache<?, ?> cache, Ticker ticker) {
        requireNonNull(cache, "cache");
        if (!cache.policy().isRecordingStats()) {
            return;
        }
        final CaffeineMetrics metrics = MicrometerUtil.register(
                registry, idPrefix, CaffeineMetrics.class, CaffeineMetrics::new);
        metrics.add(cache, ticker);
    }
Registers the stats of Caffeine {@link Cache}.
core/src/main/java/com/linecorp/armeria/internal/common/metric/CaffeineMetricSupport.java