I too as of recent am having my Pi-Hole RPi make excessive queries to api.github.com (6 times every 10 minutes).
2017-12-13 23:20:03 IPv4 api.github.com localhost OK (cached)
2017-12-13 23:20:03 IPv6 api.github.com localhost OK (cached)
2017-12-13 23:20:02 IPv4 api.github.com localhost OK (cached)
2017-12-13 23:20:02 IPv6 api.github.com localhost OK (cached)
2017-12-13 23:20:01 IPv4 api.github.com localhost OK (forwarded)
2017-12-13 23:20:01 IPv6 api.github.com localhost OK (forwarded)
pihole -v
Pi-hole version is v3.2 (Latest: v3.2)
AdminLTE version is v3.2 (Latest: v3.2)
FTL version is vDev-437af07 (Latest: v2.12)
crontab -e
shows no scheduled tasks
How does one troubleshoot this problem?