The git-daemon process (which serves the zuul-merger git repositories) sometimes gets too many connections. It defaults to 32 however:
$ sudo zgrep 'Too many children, dropping connection' /var/log/git-daemon/syslog.log* /var/log/git-daemon/syslog.log:Jan 18 22:12:16 contint1001 git-daemon[830]: Too many children, dropping connection /var/log/git-daemon/syslog.log:Feb 6 18:12:16 contint1001 git-daemon[830]: Too many children, dropping connection /var/log/git-daemon/syslog.log:Feb 6 18:12:17 contint1001 git-daemon[830]: Too many children, dropping connection /var/log/git-daemon/syslog.log:Feb 6 18:12:18 contint1001 git-daemon[830]: Too many children, dropping connection /var/log/git-daemon/syslog.log:Mar 11 04:08:53 contint1001 git-daemon[830]: Too many children, dropping connection /var/log/git-daemon/syslog.log:Apr 9 00:09:13 contint1001 git-daemon[830]: Too many children, dropping connection /var/log/git-daemon/syslog.log:Apr 9 00:09:14 contint1001 git-daemon[830]: Too many children, dropping connection /var/log/git-daemon/syslog.log:Apr 16 16:46:51 contint1001 git-daemon[830]: Too many children, dropping connection
contint2001 does not have any such messages.
the logs span more than a year. So that is fairly recent.