@faidon reports a cron spam from labservices1002.wikimedia.org:
Date: Tue, 03 Jul 2018 19:32:26 +0000 From: Cron Daemon <root@labservices1002.wikimedia.org> To: root@labservices1002.wikimedia.org Subject: Cron <root@labservices1002> if ! `/usr/local/bin/labs-ip-alias-dump.py --check-changes-only`; then /usr/local/bin/labs-ip-alias-dump.py; /usr/bin/rec_control reload-lua-script; fi (re)loaded '/etc/powerdns/recursorhooks.lua' (re)loaded '/etc/powerdns/recursorhooks.lua'
I don't see anything wrong when running the script by hand, so we could probably redirect the output to /dev/null to avoid this informative email which doesn't really give any useful information.
Probably @Andrew has more context about this, so assigning this task to him. Feel free to reassign back to me :-)