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Part of the patches to fix https://github.com/etcd-io/etcd/issues/17737 During the development of https://github.com/etcd-io/etcd/pull/17938, we agreed that during the transition to L7 forward proxy, unused features and features targeting L4 reverse proxy will be dropped. This feature falls under the unused feature. Also, the initial implementation has a bug: if connections are not created continuously, the latency accept will not work. Consider the following case: a) set latency accept b) put latency accept into effect c) latency accept will start idling the goroutine d) block-wait at accept() - waiting for new connections e) new connection comes in - establish it f) go to c -> as we can see, if the request come every x seconds, where x is larger than the latency accept time we set, we can see that the latency accept has no effect. Signed-off-by: Chun-Hung Tseng <henrybear327@gmail.com>