If files get too large or if they contain sensitive information, you could share any file output by uploading it via Pi-hole's tricorder, e.g.
cat /var/log/pihole-FTL.log | pihole tricorder
or in your case
grep "dnsmasq-dhcp" /var/log/pihole.log | pihole tricorder
(See also How do I debug my Pi-hole installation? for other ways.)
We'd then need the token to access the files on our servers, where only trusted Pi-hole members can see them, and where they are auto-deleted after 48 hours.
How did you take care of that?
Note that NetworkManager may run and manage its own dnsmasq instance, which may well interfere with Pi-hole's configuration and operation.