Warning in error logs server reached max_children setting (20), consider raising it after upgrading to v4. Please let me know how to increase process in v4?
[23-Jan-2019 07:52:13] NOTICE: fpm is running, pid 1
[23-Jan-2019 07:52:13] NOTICE: ready to handle connections
[24-Jan-2019 10:05:14] WARNING: [pool www] server reached max_children setting (20), consider raising it