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 Thanks for sending a pull request!  Here are some tips for you:\r\n\r\n1. If this is your first time, please read our contributor guidelines: https://git.k8s.io/community/contributors/guide#your-first-contribution and developer guide https://git.k8s.io/community/contributors/devel/development.md#development-guide\r\n2. Please label this pull request according to what type of issue you are addressing, especially if this is a release targeted pull request. For reference on required PR/issue labels, read here:\r\nhttps://git.k8s.io/community/contributors/devel/sig-release/release.md#issuepr-kind-label\r\n3. Ensure you have added or ran the appropriate tests for your PR: https://git.k8s.io/community/contributors/devel/testing.md\r\n4. If you want *faster* PR reviews, read how: https://git.k8s.io/community/contributors/guide/pull-requests.md#best-practices-for-faster-reviews\r\n5. Follow the instructions for writing a release note: https://git.k8s.io/community/contributors/guide/release-notes.md\r\n6. If the PR is unfinished, see how to mark it: https://git.k8s.io/community/contributors/guide/pull-requests.md#marking-unfinished-pull-requests\r\n-->\r\n\r\n**What type of PR is this?**\r\n\r\n/kind bug\r\n\r\n**What this PR does / why we need it**:\r\nFollowing CoreDNS ConfigMap changes in #78030, it is required that the ConfigMap gets updated during an `upgrade`. \r\nIf I understand correctly, `EnsureExists` doesn't update the ConfigMap during an upgrade and requires `Reconcile` for the ConfigMap to upgrade.\r\n\r\nThis is evident from the logs:\r\n\r\nLogs from `ci-kubernetes-e2e-gce-new-master-upgrade-cluster`:\r\n```\r\nevent for coredns-5cd44cdc5d-lzbmv: {kubelet bootstrap-e2e-minion-group-b8n6} Unhealthy: Readiness probe failed: Get http://10.64.2.20:8181/ready: dial tcp 10.64.2.20:8181: connect: connection refused\r\n```\r\nLogs from `ci-kubernetes-e2e-gce-master-new-downgrade-cluster`:\r\n```\r\n/etc/coredns/Corefile:4 - Error during parsing: Unknown directive 'ready'\r\n```\r\nIn both cases, the CoreDNS deployment is updated but not the ConfigMap.\r\n\r\n**Which issue(s) this PR fixes**:\r\n<!--\r\n*Automatically closes linked issue when PR is merged.\r\nUsage: `Fixes #<issue number>`, or `Fixes (paste link of issue)`.\r\n_If PR is about `failing-tests or flakes`, please post the related issues/tests in a comment and do not use `Fixes`_*\r\n-->\r\nFixes #78123 \r\n\r\n**Special notes for your reviewer**:\r\n\r\n**Does this PR introduce a user-facing change?**:\r\n<!--\r\nIf no, just write \"NONE\" in the release-note block below.\r\nIf yes, a release note is required:\r\nEnter your extended release note in the block below. If the PR requires additional action from users switching to the new release, include the string \"action required\".\r\n-->\r\n```release-note\r\nNONE\r\n```\r\n"},"comment":{"url":"https://api.github.com/repos/kubernetes/kubernetes/issues/comments/497806208","html_url":"https://github.com/kubernetes/kubernetes/pull/78302#issuecomment-497806208","issue_url":"https://api.github.com/repos/kubernetes/kubernetes/issues/78302","id":497806208,"node_id":"MDEyOklzc3VlQ29tbWVudDQ5NzgwNjIwOA==","user":{"login":"rajansandeep","id":30265084,"node_id":"MDQ6VXNlcjMwMjY1MDg0","avatar_url":"https://avatars2.githubusercontent.com/u/30265084?v=4","gravatar_id":"","url":"https://api.github.com/users/rajansandeep","html_url":"https://github.com/rajansandeep","followers_url":"https://api.github.com/users/rajansandeep/followers","following_url":"https://api.github.com/users/rajansandeep/following{/other_user}","gists_url":"https://api.github.com/users/rajansandeep/gists{/gist_id}","starred_url":"https://api.github.com/users/rajansandeep/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rajansandeep/subscriptions","organizations_url":"https://api.github.com/users/rajansandeep/orgs","repos_url":"https://api.github.com/users/rajansandeep/repos","events_url":"https://api.github.com/users/rajansandeep/events{/privacy}","received_events_url":"https://api.github.com/users/rajansandeep/received_events","type":"User","site_admin":false},"created_at":"2019-05-31T18:03:28Z","updated_at":"2019-05-31T18:03:28Z","author_association":"MEMBER","body":"@MrHohn I’m not sure, but this is a topic of discussion at sig-release. \r\n@bowei can approve this but I’m not able to reach him. 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