SOLVED
I needed to rename /etc/pihole-FTL.db and use pihole -r
to recreate. Functionality is restored albeit without any previous logs.
Problem
Since updating to 3.3 logging has ceased. The web interface shows 0 queries in the past 24 hours, and the logs show 0 requests. Pihole is in fact functional and blocking ads.
I have toggled "Disable/Enable query logging" in the web interface and run pihole -r. Also: upgrading for me required this workaround: Updated to v3.3; web UI thinks CORE still at v3.2.1 - #28 by Cito
pihole status
shows:
[✓] DNS service is running
[✓] Pi-hole blocking is Enabled
I am running Stretch.
debug - 7f43fgfp98