OCPBUGS-38573: use pooled client for etcd single member health checks

[tjungblu]

This should reduce CPU consumption because of less TLS handshakes and makes it usable from other places too.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dusk125, tjungblu

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/openshift/cluster-etcd-operator/blob/master/OWNERS)~~ [dusk125,tjungblu] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[openshift-ci-robot]

@tjungblu: This pull request references Jira Issue OCPBUGS-38573, which is invalid:

• expected the bug to target the "4.18.0" version, but no target version was set

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

In response to [this](https://github.com/openshift/cluster-etcd-operator/pull/1319): >This should reduce CPU consumption because of less TLS handshakes and makes it usable from other places too. Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fcluster-etcd-operator). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[tjungblu]

/jira refresh

[openshift-ci-robot]

@tjungblu: This pull request references Jira Issue OCPBUGS-38573, which is valid. The bug has been moved to the POST state.

3 validation(s) were run on this bug

* bug is open, matching expected state (open) * bug target version (4.18.0) matches configured target version for branch (4.18.0) * bug is in the state New, which is one of the valid states (NEW, ASSIGNED, POST)

Requesting review from QA contact: /cc @geliu2016

In response to [this](https://github.com/openshift/cluster-etcd-operator/pull/1319#issuecomment-2292980190): >/jira refresh > Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fcluster-etcd-operator). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[tjungblu]

/cherry-pick release-4.17 release-4.16 release-4.15 release-4.14

[openshift-cherrypick-robot]

@tjungblu: once the present PR merges, I will cherry-pick it on top of release-4.17 in a new PR and assign it to you.

In response to [this](https://github.com/openshift/cluster-etcd-operator/pull/1319#issuecomment-2292980686): >/cherry-pick release-4.17 release-4.16 release-4.15 release-4.14 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[tjungblu]

/override ci/prow/e2e-aws-ovn-etcd-scaling

that's a known failure unrelated to the changes here

clusteroperator/kube-storage-version-migrator should not change condition/Available

[openshift-ci[bot]]

@tjungblu: Overrode contexts on behalf of tjungblu: ci/prow/e2e-aws-ovn-etcd-scaling

In response to [this](https://github.com/openshift/cluster-etcd-operator/pull/1319#issuecomment-2292981480): >/override ci/prow/e2e-aws-ovn-etcd-scaling > >that's a known failure >> clusteroperator/kube-storage-version-migrator should not change condition/Available Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[openshift-ci[bot]]

@tjungblu: 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
ci/prow/e2e-metal-ovn-sno-cert-rotation-shutdown	9afd2bf1075a16b84d9593c5c33c8c873d0e7f3f	link	false	/test e2e-metal-ovn-sno-cert-rotation-shutdown
ci/prow/e2e-aws-etcd-recovery	9afd2bf1075a16b84d9593c5c33c8c873d0e7f3f	link	false	/test e2e-aws-etcd-recovery
ci/prow/e2e-aws-etcd-certrotation	9afd2bf1075a16b84d9593c5c33c8c873d0e7f3f	link	false	/test e2e-aws-etcd-certrotation
ci/prow/e2e-metal-ovn-ha-cert-rotation-shutdown	9afd2bf1075a16b84d9593c5c33c8c873d0e7f3f	link	false	/test e2e-metal-ovn-ha-cert-rotation-shutdown

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository. I understand the commands that are listed [here](https://go.k8s.io/bot-commands).

[openshift-ci-robot]

@tjungblu: Jira Issue OCPBUGS-38573: All pull requests linked via external trackers have merged:

• openshift/cluster-etcd-operator#1319

Jira Issue OCPBUGS-38573 has been moved to the MODIFIED state.

In response to [this](https://github.com/openshift/cluster-etcd-operator/pull/1319): >This should reduce CPU consumption because of less TLS handshakes and makes it usable from other places too. Instructions for interacting with me using PR comments are available [here](https://prow.ci.openshift.org/command-help?repo=openshift%2Fcluster-etcd-operator). If you have questions or suggestions related to my behavior, please file an issue against the [openshift-eng/jira-lifecycle-plugin](https://github.com/openshift-eng/jira-lifecycle-plugin/issues/new) repository.

[openshift-cherrypick-robot]

@tjungblu: new pull request created: #1320

In response to [this](https://github.com/openshift/cluster-etcd-operator/pull/1319#issuecomment-2292980686): >/cherry-pick release-4.17 release-4.16 release-4.15 release-4.14 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes-sigs/prow](https://github.com/kubernetes-sigs/prow/issues/new?title=Prow%20issue:) repository.

[openshift-bot]

[ART PR BUILD NOTIFIER]

Distgit: cluster-etcd-operator This PR has been included in build cluster-etcd-operator-container-v4.18.0-202408161111.p0.ga4bb609.assembly.stream.el9. All builds following this will include this PR.