UniFi - rate-limited

[SoBankIt]

Debug: https://tricorder.pi-hole.net/ULDEUrfL/

Can I please get some guidance around my UniFi/PiHole/Cloudflared configuration.

I'm constantly getting notifications about the router IP being rate limited, however I'm not noticing any service interruptions.

My setup
UniFi performing DHCP - DNS set to PiHole IP.
DNS setting on PiHole set to local cloudflared address (127)
UniFi WAN DNS set to 1.1.1.1

Conditional forwarding has been setup within PiHole.

[Bucking_Horn]

Your debug log suggests you've configured a DNS loop somehow:

*** [ DIAGNOSING ]: Pi-hole log
-rw-r--r-- 1 pihole pihole 13M Oct 31 07:46 /var/log/pihole.log
   -----head of pihole.log------
   Oct 31 00:00:07 dnsmasq[31744]: query[PTR] 1.20.168.192.in-addr.arpa from 192.168.20.1
   Oct 31 00:00:07 dnsmasq[31744]: forwarded 1.20.168.192.in-addr.arpa to 192.168.20.1
   Oct 31 00:00:07 dnsmasq[31744]: query[PTR] 1.20.168.192.in-addr.arpa from 192.168.20.1
   Oct 31 00:00:07 dnsmasq[31744]: forwarded 1.20.168.192.in-addr.arpa to 192.168.20.1
   Oct 31 00:00:07 dnsmasq[31744]: query[PTR] 1.20.168.192.in-addr.arpa from 192.168.20.1
   Oct 31 00:00:07 dnsmasq[31744]: forwarded 1.20.168.192.in-addr.arpa to 192.168.20.1

Your device at 192.168.20.1 (presumably your router) is sending a reverse lookup for its own IP address to your Pi-hole.
Conditional Forwarding then sends that request back to 192.168.20.1, which in turn sends it to Pi-hole and so on ad infinitum or until timeout.

So your router is using Pi-hole for DNS, which contradicts:

@SoBankIt

UniFi WAN DNS set to 1.1.1.1

You'd have to find out why your router would send DNS requests to Pi-hole.