Throttling is used in many scenarios to limit the concurrency and the number of requests to protect a system from being overwhelmed by large amounts of traffic.
We noticed that when setting `warmupPeriod=0` the ratelimit will loose it's hold and go crazy to do things in a rate like million or billion times per second. Hopefully a PR like this will stop one setting `warmupPeriod=0` https://github.com/google/guava/pull/3724
