docs: @PostConstruct
      public void init() {
          this.metricRegistry.register(name("gc"), new GarbageCollectorMetricSet());
          this.metricRegistry.register(name("memory"), new MemoryUsageGaugeSet());
          this.metricRegistry.register(name("thread-states"), new ThreadStatesGaugeSet());
          this.metricRegistry.register(name("fd-usage"), new FileDescriptorRatioGauge());
      }