public boolean shouldThrottle(long observed) {
    if (desiredRatePerSec < 0) {
      return false;
    }
    if (meter.getOneMinuteRate() >= desiredRatePerSec) {
      return true;
    } else {
      meter.mark(observed);
      return false;
    }
  }
Return True if throttle is required.
@param observed the newly observed units since the last time this method was called.
ambry-utils/src/main/java/com/github/ambry/utils/RejectThrottler.java