s2n-quic
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Re-establishing min_rtt
https://tools.ietf.org/id/draft-ietf-quic-recovery-32.html#name-estimating-min_rtt
Endpoints MAY re-establish the min_rtt at other times in the connection, such as when traffic volume is low and an acknowledgement is received with a low acknowledgement delay. Implementations SHOULD NOT refresh the min_rtt value too often, since the actual minimum RTT of the path is not frequently observable.
This is a potential enhancement to increase the accuracy of our RTT estimates after periods of low volume.