QPS 流控规则-排队等待控制效果，阈值超过1000后阈值不生效

sentinel 1.7.0，
1. 部署相关环境后，在sentinel控制台中配置流控规则：“qps，单机阈值，直接，排队等待”，规则中单机阈值（count）在小于1000的时能够有效控制，在大于1000的时候就不能进行有效控制了，如图

Start by reproducing the issue in the Sentinel console using a QPS rule with direct, queued waiting and compare counts below and above 1000. Trace the flow-control implementation responsible for the single-machine threshold and verify the observed request rate against the configured count; done means thresholds above 1000 control QPS consistently.

Written by the indexing model from the issue text.