Clarify the deployment responsible for API DNS in error message

[rifelpet]

with #11859 merged, we may now depend on external-dns for setting the record, so update the error message to reflect that.

[k8s-triage-robot]

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/retest

[k8s-triage-robot]

The Kubernetes project has merge-blocking tests that are currently too flaky to consistently pass.

This bot retests PRs for certain kubernetes repos according to the following rules:

• The PR does have any do-not-merge/* labels
• The PR does not have the needs-ok-to-test label
• The PR is mergeable (does not have a needs-rebase label)
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/retest

[rifelpet]

/hold

[k8s-ci-robot]

@rifelpet: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kops-e2e-cni-canal	4ef5d7a	link	true	/test pull-kops-e2e-cni-canal
pull-kops-e2e-cni-flannel	4ef5d7a	link	true	/test pull-kops-e2e-cni-flannel

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johngmyers, olemarkus

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[rifelpet]

/hold cancel