docs: public Double getSampleValue(String name, String[] labelNames, String[] labelValues) {
      for (Collector.MetricFamilySamples metricFamilySamples : Collections.list(metricFamilySamples())) {
        for (Collector.MetricFamilySamples.Sample sample : metricFamilySamples.samples) {
          if (sample.name.equals(name)
                  && Arrays.equals(sample.labelNames.toArray(), labelNames)
                  && Arrays.equals(sample.labelValues.toArray(), labelValues)) {
            return sample.value;
          }
        }
      }
      return null;
    }