* calling thread wait for that time.
   *
   * The simplest way to maintain a rate of QPS is to keep the timestamp of the last granted
   * request, and ensure that (1/QPS) seconds have elapsed since then. For example, for a rate of
   * QPS=5 (5 tokens per second), if we ensure that a request isn't granted earlier than 200ms after

        for (double qps : qpsToTest) {
          // If warmupPermits = maxPermits - thresholdPermits then
          // warmupPeriod = (1 + coldFactor) * warmupPermits * stableInterval / 2
          long warmupMillis = (long) ((1 + coldFactor) * warmupPermits / (2.0 * qps) * 1000.0);
          RateLimiter rateLimiter =
              RateLimiter.create(qps, warmupMillis, MILLISECONDS, coldFactor, stopwatch);

        for (double qps : qpsToTest) {
          // If warmupPermits = maxPermits - thresholdPermits then
          // warmupPeriod = (1 + coldFactor) * warmupPermits * stableInterval / 2
          long warmupMillis = (long) ((1 + coldFactor) * warmupPermits / (2.0 * qps) * 1000.0);
          RateLimiter rateLimiter =
              RateLimiter.create(qps, warmupMillis, MILLISECONDS, coldFactor, stopwatch);