fix 'host lookup failure' in tracing

[liuchangyan]

Fix issue #6456

Pre-review Checklist

• [ ] At least 80% unit test coverage
• [ ] E2E tests for any new behavior
• [ ] Docs PR for any user-facing impact
• [ ] Spec PR for any new API feature
• [ ] Conformance test for any change to the spec

Release Note

when I check tracing of pingsource and mt-broker-controller, both of them have this bug:

host lookup failure: lookup pingsource.knative-eventing on 10.96.0.10:53: no such host

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[knative-prow[bot]]

Hi @liuchangyan. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[codecov[bot]]

Codecov Report

Merging #6459 (1739a80) into main (c8435ed) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #6459      +/-   ##
==========================================
- Coverage   82.15%   82.15%   -0.01%     
==========================================
  Files         235      235              
  Lines       11694    11693       -1     
==========================================
- Hits         9607     9606       -1     
  Misses       1620     1620              
  Partials      467      467              

Impacted Files	Coverage Δ
pkg/adapter/v2/configurator_configmap.go	82.16% <0.00%> (-0.10%)	:arrow_down:
pkg/reconciler/broker/controller.go	84.74% <0.00%> (ø)

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[xxinran]

/ok-to-test

[knative-prow-robot]

@liuchangyan: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.