Kubernetes DNSResolutionFailure

Pods are unable to resolve DNS names.
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What is

Kubernetes DNSResolutionFailure

 ?

['Check the CoreDNS logs using `kubectl logs -n kube-system `.', "Verify the DNS configuration in the pod's `/etc/resolv.conf` file.", 'Ensure the CoreDNS service is running and healthy.', 'Check network policies that might block DNS traffic.', 'Test DNS resolution from within a pod using `nslookup` or `dig`.']

Attached error: 
Kubernetes DNSResolutionFailure
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