Changes with nginx 1.19.10 13 Apr 2021
*) Change: the default value of the "keepalive_requests" directive was
changed to 1000.
*) Feature: the "keepalive_time" directive.
*) Feature: the $connection_time variable.
*) Workaround: "gzip filter failed to use preallocated memory" alerts
appeared in logs when using zlib-ng.
--
Maxim Dounin
http://nginx.org/