Description of problem:

    A SNO cluster with more than 300 pods and 3 VMs customer will have 1500 of these clusters and 3-4 central DNS servers, ocp is sending internal queries to upstream more than 50 per minute this adds up quickly and creates a flood in the system, cutomer want to get rid of these internal queries.

a support ticket also raised
https://access.redhat.com/support/cases/#/case/04223109
9:14

I believe this issue may be due to How coredns is handling the load.
 coredns config

data:
  Corefile: |
    .:5353 {
        bufsize 1232
        errors
        log .

        health

        ready
        kubernetes cluster.local in-addr.arpa ip6.arpa

        prometheus 127.0.0.1:9153
        forward . /etc/resolv.conf

        cache 900

        reload
    }
    hostname.bind:5353

Version-Release number of selected component (if applicable):

    ocp 4.18

How reproducible:

Steps to Reproduce:

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Actual results:

Expected results:

Additional info: