-Getting the following error message on the admin page: Client 192.168.50.1 has been rate-limited (current config allows up to 1000 queries in 60 seconds)
-Did some searching online, and I'm a networking novice, so I haven't been able to understand if this is something I should be paying attention to.
-I'm not noticing anything strange on my network
-The DNS is setup on my Asus router. I have not configured it on individual devices.
All it means that a device us querying pihole more that 1000 times per minute. Pretty much abusive behavior.,
Would you be able to see what device is using that IP ? is that the ASUS router?
Possibly the router is handling all DNS queries and then forwarding requests to your Pihole.
I assume that's why you see 1000 + queries per minute.
My Pihole is the primary DNS, meaning devices will query Pihole directly, and that way I can identify my Roku as the client that gets rate-limited.
This happens especially in the first few minutes after it powers on, it just keeps calling home and abusing the Pihole
Another culprit could be your PC especially an antivirus could be doing that. And of course, there are plenty of IoT devices, tablets, phones, etc that are known for calling home too often.
What is going to be really annoying for you right now is that if your Asus router is the only client for Pihole and alrady getting rate limited , than all your other devices waiting for a DNS reply from Asus will be effectively blocked for a few minutes. Pretty annoying. because they will show popups to check your internet connection and cause you to call your Internet provider 
My router is the only client. I have the DNS set to the IP address of my Pi Hole. I thought this would be more efficient than configuring the DNS on every device in my house. Should I configure it individually?
I figured it out. I had the DNS configured on my WAN, but not LAN. Once I put it in the LAN settings, now I can see all my clients!
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